UPDATE: The band now says you can wear your damn flip flops. And Win Butler tweeted that they have “nothing to do with the dress code or taking people’s phones," so it may have come from Apple.

Arcade Fire are no strangers to a dress code—for their Reflektor parties in Bushwick a few years ago, they asked attendees to wear fancy costumes. And now they're bringing some new rules to Grand Prospect Hall, where they're hosting a record release show for their latest album,
Everything Now, later this week.

The free show — taking place this Thursday, July 27th (the lottery already took place) — will not be open to anyone wearing the much-contested piece of footwear: the flip flop. Here are Arcade Fire's full list of demands and expectations of their fans (which we assume is delivered with a wink, given how lax they were last time they tried to institute a dress code).

PHONE-FREE VIEWING EXPERIENCE: No cellphones, cameras or recording devices will be allowed at this show. Upon arrival, all phones and smart watches will be secured in Yondr pouches that will be unlocked at the end of the show. Guests maintain possession of their phones throughout the night, and if needed, may access their phones at designated Yondr unlocking stations in the lobby.

WHAT TO WEAR: Our dress code is HIP & TRENDY as if you are going to a concert or night out with friends! The event is standing-room-only so please plan accordingly. PLEASE DO NOT WEAR shorts, large logos, flip flops, tank tops, crop tops, baseball hats, solid white or red clothing. We reserve the right to deny entry to anyone dressed inappropriately.

And if you and your flip flops don't make it into the show on Thursday, Apple will be livestreaming it. Arcade Fire's tour for the album (which is out this Friday) starts in September, when they'll be playing MSG.