PARTY GAMES
Everyone in the line is dressed as Border Patrol to keep the rest of your family out of America.
And another classic: Pin the Blame on the Immigrant.
CONVERSATION STARTERS
Put up sticky notes with factoids about Mexican culture.
ex. Did you know the official colors of Mexico are red and green? They symbolize salsa and guacamole.
NOTE: Factoids do not have to contain facts.
ALCOHOL
Real sangria would be delicious and classy. But it takes a long time (over 10 minutes!) to make. So make sangria the bootleg way... get a bucket and fill it with Kool-Aid and Vodka.
PARTY TRICKS
If you have a buddy who works in a lab, then you can pull this party trick.
Have them bring in some full test tubes used for employee drug screening and serves them with a slice of lime. This guessing game is called "Is this a Warm Corona or Piss?"
FOOD
You could serve authentic Mexican food. But that would like, require effort. So make the party BYOB. (Bring Your Own Burrito)