Go to Event profile which user want to join by searching from global search or find Event from explore list also.
Click on button to join the event at the bottom right corner of the event cover section.
Public Event Click on join will join automatically if set from the settings as auto join.
Will be in the pending status and will join after the event admin will approve if from settings its set as request to join.
Find event profile from left drawer explore list by tapping on the top left corner logo of the community and then go to the third slider. There user have to tap on the events and go to the event listing.
Click on Join button to join the event.
If set as auto join it will join automatically.
If set as request to join it will send an join request to the event admin if admin approves the request user will be joined as a member of that specific event.