Oktoberfest is a bit much for me, these days, but I'm a huge fan of the smaller beer festivals in Germany. It's great to sit at a table under the big tent with some strangers and bring a rack of beers (you can often buy a metal 8-pack holder of small beers) and set them out for the table. When it is time, someone else will usually just replace the rack. It's a great way to quickly become a part of a group of new friends. That's what the one I'm planning to go to is like.
I'm also a fan of Frühschoppen, which is when a crowd gathers at the tent when it opens at 7 or 8 am and settles in for a long day of hanging out.
that actually sounds perfect for me. I suspect I'm too old to handle the real deal o'fest