Do’s, don’ts from ‘Wedding Dates’ experts Efron, Devine & Plaza

It’s that time of year — find something to wear, fly across the country, pray for an open bar, toast your college BFF and try not to pick the worst thing on the happy couple’s registry. Luckily, we have Mike and Dave Need Wedding Dates (now showing) to help us wade through common do’s and don’ts. USA TODAY’s Andrea Mandell talks weddings with Zac Efron, Adam Devine and Aubrey Plaza.

IF YOU’RE IN SOMEONE’S WEDDING, DO ...

Devine: “Make friends with the cool weird aunts.”

Plaza: “Always make it about yourself and what you’re going through on that day.”

Efron: “Dance with the very little girls for a few cute dances. Like, spin them around because it makes everybody very, very happy.” Devine: “Unless you’re scary-looking.”

DON’T ...

Devine: “People say don’t be the drunkest one there, but you’re encouraging other people to drink and that kind of gets the party started. So that’s I think a do.”

Plaza: “Don’t stop yourself from just getting up and speaking. Speak your mind at any moment.”

YOU MEAN FOR SPEECHES, RIGHT?

Plaza: “I’d say, during the ceremony, the reception, grab that mike.”

WHAT’S THE MOST AWKWARD THING YOU’VE SEEN AT A WEDDING?

Plaza: “I heard a wedding toast where someone was actually making 9/11 jokes and I thought that was not appropriate.”

Efron: “I saw one of my good friends — this was very late in the night — strip down in his underwear and do a flex-off with another dude who was a bodybuilder — in front of everyone.”

WHAT’S THE WORST WEDDING GIFT YOU’VE EVER GOTTEN SOMEONE?

Efron: “Crystal stemware?” Plaza: “I feel like I gave someone a breast pump once.”

Devine: “I gave a pretty (crappy) gift. I gave this girl, she was a friend of mine, a leash — like the ball and chain sort of ( joke). And then she opened it up in front of everyone and they all took it like a sexual dominatrix gift. So everyone thought I was a super-perv.”