Quote from Sharp
Not at all. You can go there just to hang out with people, watch matches or play friendlies at most tournaments, competing usually cost extra but it is in no means required. (Talking from my own experience, it might differ between tournies.) You can go there with no experience and have a great time, I assure you. I would recommend bringing friends though, but it's obviously not required since you can always make friends at the tourney.
And you can make usernames for yourself when playing like HBox and Mew2King?