Ashley,
This is a great question and shows that you're on the right path...good for you!
When I'm performing at Red Robin, I have maybe 20-25 tables a night I go to...doesn't seem like a lot, but it is when I'm doing a 6-8 minute routine. Finding the right person to help me is crucial, otherwise my whole show at that particular table will be hell if I get off on the wrong foot. Sure, I'd come back and surprise them to death, but it still wouldn't be the same.
How *I* find the right people to assist me is done with a few things. First, approaching the table. As I'm walking up to them, I'm scanning and trying to find out who the MAIN person is.....the one getting all the attention and more likely looking to have a good time. That's the person I want to win over and make my friend. If they're having a good time, others will naturally follow.
Also, my opener. I always start off by asking them how they're doing, even before I introduce myself as a magician. The talkative ones are my friends, and they are the ones I want to have help me. If they're openly answering my questions and we're carrying on a conversation, this is building a nice rapport for myself. A *key* element in making sure the show goes well.
As you see, by the time I'm at the table, I already have at least 1 person in mind to help me. That's all I need at the moment. They help with the first trick, and then whoever seems most interested and eager, and gives me the best reaction is the person I'll have help me with my next one. They all keep feeding off of each other, and that makes my job that much easier.
Hope I answered your question, and don't hesitate to PM me if you need anything.
Best.
Steve