**Description** The `ContestManager` contract lacks event emissions for critical actions such as creating, funding, and closing contests. Events are crucial in Solidity contracts for logging important actions, as they provide an immutable record on the blockchain that can be indexed and queried by off-chain applications. Without these events, tracking the state and history of the contract becomes difficult, which can hinder monitoring, debugging, and auditing efforts. **Impact** - **Visibility**: Without events, external parties (such as users or monitoring systems) cannot easily track when contests are created, funded, or closed. This lack of visibility can lead to difficulties in verifying the correct operation of the contract. - **Debugging**: Developers and auditors will find it more challenging to diagnose issues or verify contract behavior without event logs. In the event of a bug or issue, the absence of events makes it harder to trace the sequence of actions leading up to the problem. - **Transparency**: Participants in the contests might not have a clear understanding of the state of the contract, which could lead to mistrust or uncertainty. **Proof of Concepts** The following functions in the `ContestManager` contract are identified as lacking event emissions: - `createContest` - `fundContest` - `closeContest` For example, in the `createContest` function: ```solidity function createContest(address[] memory players, uint256[] memory rewards, IERC20 token, uint256 totalRewards) public onlyOwner returns (address) { Pot pot = new Pot(players, rewards, token, totalRewards); contests.push(address(pot)); contestToTotalRewards[address(pot)] = totalRewards; // No event emitted to signal that a new contest has been created. return address(pot); } ``` **Recommended Mitigation:** Add event declarations and emit statements in the contract to log significant actions. ```solidity event ContestCreated(address indexed contestAddress, uint256 totalRewards); event ContestFunded(address indexed contestAddress, uint256 amount); event ContestClosed(address indexed contestAddress); ```