Some organizers choose to require members to pay a fee to attend some events. It is up to each organizer to decide if they want to charge fees, how to collect them, and how the money will be spent.
Learn how to charge an event fee.
Generally, these fees are used to cover costs associated with an event - things like space rentals, speaker fees, door prizes, or swag. Because organizers pay out-of-pocket for their personal organizer subscription plan to run their groups, event fees can also help cover those costs.