Restricting this to cases that outright call it a party, not simple a hangout that got a bit big.

Depends on which group of friends I'm with.

-If I'm with my friends from High School it will normally involve a lot of Wii U, a lot of movies, and a lot of wandering to the park at 5 in the morning to talk about shit.
-If I'm with my friends from College it will normally involve a lot of Rock Band, and practically everyone other than me is drinking and smoking weed.

I will note I go to very tame parties compared to most people.
I outright avoid parties (and people in general) that like to focus entire events purely around alcohol or weed and then doing stupid shit.
I mean, alcohol and weed can be nice ways for people to enhance the enjoyment but there's more you can do with people than [i]just[/i] drinking and getting high and then doing stupid and dangerous shit because of it.