I would suggest grabbing pen & paper,walk your crowd and take requests to get a feel for what people want to hear. Simple thing to do but it pays off in a few ways.
#1 The crowd sees your interested in what they like.
#2 Might make some more comfortable coming up to the booth to make requests(when you don’t have the time to walk the crowd) .
#3 You now have a playlist that you didn’t have to program.
#4 You have a ready made “shopping list” for requests you don’t own
Mixed crowds can be rough but remember no matter how hard you try you will NEVER please everyone however with this little plan in effect you can try your best to please most of them.