During seasonal events, you often have the opportunity to collect event credits by completing missions associated with the event. For example, you can collect Easter eggs as event credits by completing Easter missions during the Easter event.

You can find the event menu by clicking on the parcel symbol in the top bar and selecting the event name, or by choosing the event collection item on the top bar (mobile version only).

In the event menu, you can see how many event credits you have. Once you've collected enough, you can upgrade to a new event level. This unlocks additional event missions and grants a credit bonus for completing them. You can also purchase event credits from the event shop.

In your alliance menu, there is an event section where a progress bar fills up whenever an alliance member completes an event-related mission. Once the bar is full, your alliance can start a special alliance event. This menu also includes a leaderboard showing the performance of all alliances.