Re: Being there on your own.
I used to go and see shows by myself all the time. I got tired of going to see shows, only to be watching the show and have my date want my attention the whole time when I'm trying to watch the band (which is what I went there and paid money to do).
No worries. It only gets lonely between bands or sets, and there should be plenty to do; take a walk around the venue, read the scrawlings in the bathroom stalls, check out the merch booth/table, scope out someone wearing a shirt of another band that you like (represent!) and strike up a conversation, etc... In case all else fails, bring a book!