It's July and I have maxed out Courage and Charm already.

You get like 2 social links at night - Devil (Tanaka) and Tower (Monk guy).
Other than that? No - there's fuck all to do at night in P3.

Nope

You can go to the arcade at night to up your persona stats like STR, MAG, or AGI

>>380879839
Academics takes 4-5 times as long as courage and charm to max, I believe, so you'll be doing that for a while.

>>380879839
Some nights the arcade has a machine that gives more Academics than studying. 2 night SLs as well. Arcade machine also raises one Persona's STR/MAG/AGI.

Could also walk Koromaru on some nights.

study academics, sleep early, get the devil and tower social links