diff --git a/contracts/calendar-contract/Cargo.toml b/contracts/calendar-contract/Cargo.toml
new file mode 100644
index 0000000..4510c5e
--- /dev/null
+++ b/contracts/calendar-contract/Cargo.toml
@@ -0,0 +1,41 @@
+[package]
+name = "calendar-contract"
+version = "0.0.0"
+edition = "2021"
+publish = false
+
+[lib]
+crate-type = ["cdylib", "lib"]
+doctest = false
+
+[dependencies]
+soroban-sdk = { workspace = true }
+
+[dev-dependencies]
+soroban-sdk = { workspace = true, features = ["testutils"] }
+
+[profile.release]
+opt-level = 'z'
+overflow-checks = true
+debug = 0
+strip = true
+debug-assertions = false
+panic = 'abort'
+codegen-units = 1
+lto = true
+
+[profile.test]
+opt-level = 0
+debug = true
+debug-assertions = true
+overflow-checks = true
+lto = false
+panic = 'unwind'
+incremental = true
+codegen-units = 256
+rpath = false
+
+[package.metadata.soroban]
+generate-snapshots = false
+snapshot-dir = "test_snapshots"
+verbose-snapshots = false
diff --git a/contracts/calendar-contract/src/contract.rs b/contracts/calendar-contract/src/contract.rs
new file mode 100644
index 0000000..6f91fce
--- /dev/null
+++ b/contracts/calendar-contract/src/contract.rs
@@ -0,0 +1,51 @@
+use crate::error::CalendarError;
+use crate::events;
+use crate::storage;
+use soroban_sdk::{Address, BytesN, Env};
+
+pub fn initialize(
+    env: &Env,
+    admin: &Address,
+    vault_address: &Address,
+) -> Result<(), CalendarError> {
+    if storage::has_admin(env) {
+        return Err(CalendarError::AlreadyInitialized);
+    }
+    storage::set_admin(env, admin);
+    storage::set_vault_address(env, vault_address);
+    Ok(())
+}
+
+pub fn pause(env: &Env) -> Result<(), CalendarError> {
+    let admin = storage::get_admin(env).ok_or(CalendarError::NotInitialized)?;
+    admin.require_auth();
+    storage::set_paused(env, true);
+    events::contract_paused(env, true);
+    Ok(())
+}
+
+pub fn unpause(env: &Env) -> Result<(), CalendarError> {
+    let admin = storage::get_admin(env).ok_or(CalendarError::NotInitialized)?;
+    admin.require_auth();
+    storage::set_paused(env, false);
+    events::contract_paused(env, false);
+    Ok(())
+}
+
+pub fn transfer_admin(env: &Env, new_admin: &Address) -> Result<(), CalendarError> {
+    let admin = storage::get_admin(env).ok_or(CalendarError::NotInitialized)?;
+    admin.require_auth();
+    if storage::is_paused(env) {
+        return Err(CalendarError::ContractPaused);
+    }
+    storage::set_admin(env, new_admin);
+    events::admin_transferred(env, &admin, new_admin);
+    Ok(())
+}
+
+pub fn upgrade_contract(env: &Env, new_wasm_hash: BytesN<32>) -> Result<(), CalendarError> {
+    let admin = storage::get_admin(env).ok_or(CalendarError::NotInitialized)?;
+    admin.require_auth();
+    env.deployer().update_current_contract_wasm(new_wasm_hash);
+    Ok(())
+}
diff --git a/contracts/calendar-contract/src/error.rs b/contracts/calendar-contract/src/error.rs
new file mode 100644
index 0000000..b7afd48
--- /dev/null
+++ b/contracts/calendar-contract/src/error.rs
@@ -0,0 +1,10 @@
+use soroban_sdk::contracterror;
+
+#[contracterror]
+#[derive(Copy, Clone, Debug, Eq, PartialEq, PartialOrd, Ord)]
+#[repr(u32)]
+pub enum CalendarError {
+    NotInitialized = 1,
+    AlreadyInitialized = 2,
+    ContractPaused = 3,
+}
diff --git a/contracts/calendar-contract/src/events.rs b/contracts/calendar-contract/src/events.rs
new file mode 100644
index 0000000..e5687b4
--- /dev/null
+++ b/contracts/calendar-contract/src/events.rs
@@ -0,0 +1,13 @@
+#![allow(deprecated)]
+use soroban_sdk::{symbol_short, Address, Env};
+
+pub fn contract_paused(env: &Env, paused: bool) {
+    let topics = (symbol_short!("paused"),);
+    env.events().publish(topics, paused);
+}
+
+pub fn admin_transferred(env: &Env, old_admin: &Address, new_admin: &Address) {
+    let topics = (symbol_short!("adm_xfer"),);
+    env.events()
+        .publish(topics, (old_admin.clone(), new_admin.clone()));
+}
diff --git a/contracts/calendar-contract/src/lib.rs b/contracts/calendar-contract/src/lib.rs
new file mode 100644
index 0000000..b781830
--- /dev/null
+++ b/contracts/calendar-contract/src/lib.rs
@@ -0,0 +1,38 @@
+#![no_std]
+
+mod contract;
+mod error;
+mod events;
+mod storage;
+#[cfg(test)]
+mod test;
+mod types;
+
+use crate::error::CalendarError;
+use soroban_sdk::{contract, contractimpl, Address, BytesN, Env};
+
+#[contract]
+pub struct CalendarContract;
+
+#[contractimpl]
+impl CalendarContract {
+    pub fn init(env: Env, admin: Address, vault_address: Address) -> Result<(), CalendarError> {
+        contract::initialize(&env, &admin, &vault_address)
+    }
+
+    pub fn pause(env: Env) -> Result<(), CalendarError> {
+        contract::pause(&env)
+    }
+
+    pub fn unpause(env: Env) -> Result<(), CalendarError> {
+        contract::unpause(&env)
+    }
+
+    pub fn transfer_admin(env: Env, new_admin: Address) -> Result<(), CalendarError> {
+        contract::transfer_admin(&env, &new_admin)
+    }
+
+    pub fn upgrade_contract(env: Env, new_wasm_hash: BytesN<32>) -> Result<(), CalendarError> {
+        contract::upgrade_contract(&env, new_wasm_hash)
+    }
+}
diff --git a/contracts/calendar-contract/src/storage.rs b/contracts/calendar-contract/src/storage.rs
new file mode 100644
index 0000000..df52468
--- /dev/null
+++ b/contracts/calendar-contract/src/storage.rs
@@ -0,0 +1,46 @@
+use soroban_sdk::{contracttype, Address, Env};
+
+#[contracttype]
+#[derive(Clone)]
+pub enum DataKey {
+    Admin,
+    VaultAddress,
+    IsPaused,
+}
+
+// --- Admin ---
+
+pub fn has_admin(env: &Env) -> bool {
+    env.storage().instance().has(&DataKey::Admin)
+}
+
+pub fn set_admin(env: &Env, admin: &Address) {
+    env.storage().instance().set(&DataKey::Admin, admin);
+}
+
+pub fn get_admin(env: &Env) -> Option<Address> {
+    env.storage().instance().get(&DataKey::Admin)
+}
+
+// --- Vault ---
+
+pub fn set_vault_address(env: &Env, vault: &Address) {
+    env.storage().instance().set(&DataKey::VaultAddress, vault);
+}
+
+pub fn get_vault_address(env: &Env) -> Option<Address> {
+    env.storage().instance().get(&DataKey::VaultAddress)
+}
+
+// --- Pause ---
+
+pub fn is_paused(env: &Env) -> bool {
+    env.storage()
+        .instance()
+        .get(&DataKey::IsPaused)
+        .unwrap_or(false)
+}
+
+pub fn set_paused(env: &Env, paused: bool) {
+    env.storage().instance().set(&DataKey::IsPaused, &paused);
+}
diff --git a/contracts/calendar-contract/src/test.rs b/contracts/calendar-contract/src/test.rs
new file mode 100644
index 0000000..7bf28f3
--- /dev/null
+++ b/contracts/calendar-contract/src/test.rs
@@ -0,0 +1,140 @@
+#![cfg(test)]
+
+use super::*;
+use crate::error::CalendarError;
+use soroban_sdk::{testutils::Address as _, testutils::Events, Address, Env, Symbol, TryIntoVal};
+
+fn setup() -> (Env, Address, Address, CalendarContractClient<'static>) {
+    let env = Env::default();
+    env.mock_all_auths();
+    let contract_id = env.register(CalendarContract, ());
+    let client = CalendarContractClient::new(&env, &contract_id);
+    let admin = Address::generate(&env);
+    let vault = Address::generate(&env);
+    (env, admin, vault, client)
+}
+
+#[test]
+fn test_initialize() {
+    let (_env, admin, vault, client) = setup();
+    let res = client.try_init(&admin, &vault);
+    assert!(res.is_ok());
+}
+
+#[test]
+fn test_initialize_twice_fails() {
+    let (_env, admin, vault, client) = setup();
+    client.init(&admin, &vault);
+    let res = client.try_init(&admin, &vault);
+    assert_eq!(res, Err(Ok(CalendarError::AlreadyInitialized)));
+}
+
+#[test]
+fn test_pause() {
+    let (env, admin, vault, client) = setup();
+    client.init(&admin, &vault);
+    client.pause();
+
+    let events = env.events().all();
+    let last = events.last().unwrap();
+    let topic: Symbol = last.1.get(0).unwrap().try_into_val(&env).unwrap();
+    assert_eq!(topic, Symbol::new(&env, "paused"));
+}
+
+#[test]
+fn test_unpause() {
+    let (env, admin, vault, client) = setup();
+    client.init(&admin, &vault);
+    client.pause();
+    client.unpause();
+
+    let events = env.events().all();
+    let last = events.last().unwrap();
+    let topic: Symbol = last.1.get(0).unwrap().try_into_val(&env).unwrap();
+    assert_eq!(topic, Symbol::new(&env, "paused"));
+}
+
+#[test]
+fn test_pause_not_initialized() {
+    let (_env, _admin, _vault, client) = setup();
+    let res = client.try_pause();
+    assert_eq!(res, Err(Ok(CalendarError::NotInitialized)));
+}
+
+#[test]
+fn test_transfer_admin() {
+    let (env, admin, vault, client) = setup();
+    client.init(&admin, &vault);
+    let new_admin = Address::generate(&env);
+    let res = client.try_transfer_admin(&new_admin);
+    assert!(res.is_ok());
+}
+
+#[test]
+fn test_transfer_admin_emits_event() {
+    let (env, admin, vault, client) = setup();
+    client.init(&admin, &vault);
+    let new_admin = Address::generate(&env);
+    client.transfer_admin(&new_admin);
+
+    let events = env.events().all();
+    let last = events.last().unwrap();
+    let topic: Symbol = last.1.get(0).unwrap().try_into_val(&env).unwrap();
+    assert_eq!(topic, Symbol::new(&env, "adm_xfer"));
+}
+
+#[test]
+fn test_pause_blocks_transfer_admin() {
+    let (env, admin, vault, client) = setup();
+    client.init(&admin, &vault);
+    client.pause();
+    let new_admin = Address::generate(&env);
+    let res = client.try_transfer_admin(&new_admin);
+    assert_eq!(res, Err(Ok(CalendarError::ContractPaused)));
+}
+
+#[test]
+fn test_unpause_restores_transfer_admin() {
+    let (env, admin, vault, client) = setup();
+    client.init(&admin, &vault);
+    client.pause();
+    client.unpause();
+    let new_admin = Address::generate(&env);
+    let res = client.try_transfer_admin(&new_admin);
+    assert!(res.is_ok());
+}
+
+#[test]
+#[should_panic]
+fn test_pause_requires_auth() {
+    let env = Env::default();
+    let contract_id = env.register(CalendarContract, ());
+    let client = CalendarContractClient::new(&env, &contract_id);
+    let admin = Address::generate(&env);
+    let vault = Address::generate(&env);
+
+    // Init with mocked auth
+    env.mock_all_auths();
+    client.init(&admin, &vault);
+
+    // Clear auth — pause should panic
+    env.mock_auths(&[]);
+    client.pause();
+}
+
+#[test]
+#[should_panic]
+fn test_transfer_admin_requires_auth() {
+    let env = Env::default();
+    let contract_id = env.register(CalendarContract, ());
+    let client = CalendarContractClient::new(&env, &contract_id);
+    let admin = Address::generate(&env);
+    let vault = Address::generate(&env);
+    let new_admin = Address::generate(&env);
+
+    env.mock_all_auths();
+    client.init(&admin, &vault);
+
+    env.mock_auths(&[]);
+    client.transfer_admin(&new_admin);
+}
diff --git a/contracts/calendar-contract/src/types.rs b/contracts/calendar-contract/src/types.rs
new file mode 100644
index 0000000..e69de29