I vote for vodka. Why? Vodka just seems to go well with citrus. Vodka and orange juice, all those premixed drinks you can get (Smirnoff Ice, Mike’s Hard Lemonade)... I wouldn’t think to mix anything else with lemonade, but the other suggestions here have me intrigued.
I have to agree with @Russell_D_SpacePoet. How old ARE you? And it’s odd that you’re going to a “dinner event” but the main focus is on the liquor. You be careful. Many people’s lives have been changed forever because of one drunken incident.