Okay, so vodka is definitely that strong clear stuff, you got that right!!! And yeah, pickles are totally a thing, like a classic pairing, especially for like a Russian style shot, it's called a chaser, to cut through the taste! It's not weird, its smart for balance!
For a party, you want things that are easy to grab and not too heavy, you know, so your macros don't get all out of whack. I always say, go for stuff that's hydrating or has good fat content to help slow absorption, not that your trying to get wasted, but for general wellness, know what I mean??
Think about a charcuterie board! Some nice cheeses, sliced meats, olives, and yeah, more pickles or gherkins. Veggie sticks with hummus or a yogurt dip are good too; they're clean eating. Mini quiches or little savory pastries are also good, but watch your portions!! Your dads and uncles probably just want easy finger foods, so chips are fine, but maybe try some that are less greasy, like pita chips or some good whole-grain crackers. Make sure theirs plenty of water too, for hydration!!!