Alcohol after smoking weed?

I know it's bad, but hey... I smoked weed for the 1st time today. I did it about 3 hours ago and did too much and got a bit ill and threw up a bit. The effects have more or less pretty much worn off. But theres a HUGE party at my uni's clubhouse thing tonight which i wasn't planning to go to but I've just been invited out by a really hot girl....... So now i wanna go to it obviously lol. I've heard bad things about smoking weed and drinking at the same time, but what about when (It seems) all the previous narcotic effects have worn off.