It sounds like you need to consider a few things: keeping the food relatively inexpensive, making sure that the food is easy to eat (no messy bowls, spoons, etc., but foods that people can eat while roaming around), and food that goes well with beer and wine.
So I'd suggest:
Spiced nuts with rosemary: (there are lots of easy spiced nuts recipes online, basically you buy bulk nuts, toss them with a little sugar or honey, some spices like cumin or cayenne pepper, salt, and bake them briefly). The addition of chopped rosemary makes them really different and interesting.
Antipasto or Caprese skewers: little plastic or wooden picks with tomato, mozzarella, and a basil leaf. The tomato can be a cherry tomato half, the mozzarella can be a cube cut from a block of mozzarella rather than a more expensive tiny mozzarella ball. You could add a small slice of ham or salami. Drizzle with a tiny bit of olive oil, (and balsamic vinegar if you like).
A simple bread and fruit platter: baguette slices (the bakery dept in the grocery store will slice a baguette for you, for free, and they'll do it in nice even slices in minutes), small crispy bread sticks or long thin ones (usually in the Italian section of the supermarket), simple grapes both green and red
All of those can be made in large quantities, can be eaten on just a small cocktail napkin, and they'll go well with beer and wine.