Last month, WhatsApp announced a feature called "Community Events" and said it would be rolled out to groups that aren't part of any community "in the coming months." Available globally for all group chats, it is already available for some users on WhatsApp for Android beta version 2.24.14.9.
This message comes from WABetaInfo, who shared a screenshot (shown below) showing the event feature available to regular group chats that aren't connected to any community. ” icon, which allows you to create a new event. Once created, event invitations can be viewed and accepted by group members, but changes to the event are expected to be made only by the event creator. It's also worth mentioning that group events are fully encrypted.
If you're an Android user and can't wait for the public release of the events feature for regular group chats, you can join the beta program to try it out.