Custom questions on events

Allow custom questions (single choice, multiple choice, free text, number) as part of the event RSVP, so registration and answers happen in one step and appear in the attendee overview and export. Currently you can’t add extra questions or choice fields (e.g. dropdown, multiple choice) to an event. Use cases: food choice or amount of plus ones for an event. Current workaround is a separate form next to the event, which causes: - People RSVP but don’t fill in the form, or the other way around - (possible) Duplicate form submissions, which means unreliable counts for catering or gift purchases - No link between the RSVP and the form answers