For now there is a social networking/ticket buying site just for you. Songkick.com was originally launched as a concert encyclopedia/ticket shopping comparison site, but is now relaunched with a crowdsourced aspect (you can still buy tix, of course). There are over a million current and future shows online, but anyone can add shows (someone started the HFStival shows, and I finished them). Very addictive for me – I’ve been writing down my shows since college, and I’ve had them all online for over ten years. It’ll take a while to put all of mine in, but that’s fun for me.