I think that all the mother figures of haikyuu just go out once a month and meet somewhere and just get drunk all weekend and then just complain about their husband's and their kids and in the end flirt with other guys because they are so drunk and don't know what's happening.

Iwaizumi becomes a softie and kisses lots of guys.One one he fcked a guy but that's not the point.

Akaashi is sober and talks to Bokuto.

Suga just drinks and cries.

Semi breaks stuff.

Yaku pretends to have seizures.

Moniwa just drinks away everything he possibly can and brings wigs to try lots of free samples.

In the end they are all picked up by their boyfriend's.