What's a good Android app for keeping track of panels and events at a convention, so I don't waste time wandering around?

Look, the Anime Matsuri app ain't gonna win any beauty contests, and the tutorial is useless, but once you figure it out, it's actually pretty handy. I used it last year to keep track of the panels I wanted to see. No BS, it saved me a bunch of time running around like a chicken with its head cut off. The schedule updates are clutch, especially when they announce stuff last minute. Battery life's always a concern with these things, so I packed a power bank, just in case. It's not built like a brick house, but it survived a couple of accidental drops onto the concrete floor, so that's a plus. If you're heading to Anime Matsuri, it's worth downloading. Just don't expect it to hold your hand.