If offering cocktails, plan for one special seasonal cocktail that you can mix ahead, then provide ingredients for basic mixers like:
club soda, simple syrup, coke, cherries, luxardo, vermouth, bitters, lime wedges, olives, and a variety of 3 - 5
classic liquors.
For alcohol lightweights, I'll shake up a regular set of these (or
classic) margaritas, add around 3/4 oz of simple syrup, pour it into a highball glass with ice then top with
club soda to make a nice spritzer.