Yeah, since our club is so small I just keep a mental list of who to expect, predominantly to make sure the speaker doesn't start before everyone has arrived, because I really would not have expected anyone to just come like that. I wasnt positive they weren't club members, because the treasurer has the most up to date list. I'm so new at this that I wasn't prepared to call them out, but our president is going to report them to the dean
Last lecture we had someone come who wasn't a member, but I had encouraged her to and she didn't take food. Today we also had a member come who didn't RSVP, but she 1) actually had paid dues and 2) waited until everyone else had gotten lunch before she took anything, so that was totally fine