Hello!
   I know I legally cannot raffle off items at an event, but can I do giveaways with the people who bought tickets?  
   I am running an 18+ TTRPG actual play entertainment event* and thought it might be fun to giveaway some "adult items" to audience members?  Has anyone encountered this before? Can I just give a number to everyone who shows up and then do a random number generator?

*Sex & Dread, Fri 3pm

I've attended many games in the past several years where the event organizer gave participants raffle tickets, and there was a drawing later in the day for free prizes.

you can do raffles, you just cant charge for tickets for the raffle