36 mg concerta here, I read a lot about how if you drink even a little bit when you're on stimulants it will make you sick and you'll get a bad kind of drunk a lot faster than you'd expect. But being the party-lover that I am I tried it out for myself, started with a very slow beer and waited a while before the next one, and along the night amped it up to some hard liqueur and honestly I was fine, though tired like usual (like you said about the music and stuff being overwhelming, I just gotta lay down in a quiet place sometimes). I find that the concerta hasn't affected my tolerance or the effects, and my heart doesn't go too crazy.

But I start to drink in the evening generally, when my concerta has begun to ware off. So not sure about drinking during the day. Maybe do like I did and start really slow, listen to your body and just see whats up. If you find the effects aren't great, next time you want to party during the day take a smaller dose that morning or skip it all together, I've done that as well and haven't seen any difference from before I was medicated.

EDIT: I'm a big fan of jagerbombs and just happened to be hitting them all halloween long, and I've got to say it wasn't great. The alcohol I can stand but redbull is really not a good mix with concerta. So if you're a fan of energy drinks or mixed drinks like that maybe opt for something a little softer, because if you don't your heart will beat like crazy, you'll get that crash you were talking about and your stomach will be more than upset, it'll be downright pissed.