Tips for new people (and myself) on how to meet and greet others:
1) ask about their cosplay, start talking and go from there..
2) ask to take a picture or two, same above.
3) go to events you have interest in and try to mingle. Note, most events you are watching things, so it may be difficult to talk to anyone other then setup or after the "showing."
4) cosplay! If you are in cosplay, and it is any decent at all, people will come talk to you! (I'm hoping)
5) not really a new thing, but if you get talking to someone/s, ask what they are up to (if it isn't obvious) and if you can hang out with them. Most people should be glad to have more like minded fans to hang out with as long as they are not busy or into their own private conversations with those they already know.