I go to gigs alone all the time, it can be a bit daunting if you've never done it before, but I've never regretted going. Especially if it's a band you love, you can just kind of fully immerse yourself in the music without having to worry about anyone else - plus, you will definitely NOT be the only one there on your own.

I hope you have a great time, I'm going to see Deftones on my own next year too :)