As requested by Angelo, I’m posting my questions as separate posts.

I understand that Events Manager Pro allows for custom booking forms. I am thinking about buying the Pro version if this can be done:

1. Organizer creates event
2. Organizer lists 10 things that are needed for the event
3. Users make a booking and checkbox 1 of the 10 things they can bring

This is useful for events where organizer asks for help in what people should bring. Example:

Guests: please choose 1 item to bring to the event:
O Fire wood. Brought by: _____?
O Lighter/ Fire starter. Brought by: _____?
O Soap. Brought by: _____?
O Towel. Brought by: _____?

User 1 makes a booking and chooses “Soap” to bring. User 3 brings “Fire wood”. Now, the list should look like this:

Guests: please choose 1 item to bring to the event:
O Fire wood. Brought by: User 3
O Lighter/ Fire starter. Brought by: _____?
O Soap. Brought by: User 1
O Towel. Brought by: _____?

https://wordpress.org/plugins/events-manager/