If it's just some drops of beer you're probably fine. The only thing that could happen is that the keys or the trackpad could get sticky inside. If you wiped it with cloth already, "tent" the mbp or leave it opened upside down for a couple of hours. I doubt this will do anything if it's just a couple of drops though.
Take a cotton swab or clean cloth and put some 70%+ isopropyl alcohol on it, wipe where the drops fell (including the tiny gap between trackpad/key and the rest of the laptop and leave it alone to dry.
Let's hope those tiny bits don't corrode anything inside. I'm 99% sure you're fine.