If you happen to be single, fluent in Japanese and have some single Japanese friends, ask them to invite you along to a goukon party (otherwise called a kompa).
Mind you, the main purpose of a goukon is to set you up with a date but what the heck, it's a lot of fun and not as serious as a konkatsu.
I met lots of friends that way. I also picked up a stalker or two but that's a different story altogether.
