Hey man, long time no see! (I think it was the Jeff Beck show in Cinci with Finatic a few years ago.)
I got the Lumix FZ300 and have been pretty happy with it so far, though I'm still on a learning curve to find the best settings for video. Recording time limit is dependent on which format you're shooting in (AVCHD, MP4, 4K), but is generally 20-30 minutes, so it's easy enough to find a spot between songs in that time frame to stop and quickly re-start the recording.
Here's a video from the King's X show Finatic and I recorded a couple of weeks ago. He was on the right side by Ty Tabor with a Canon G20 camcorder and I was using my Lumix on Doug's side. Audio is from my Lumix with no external mic --not great, but not bad considering how loud the show was. I think the picture quality of the Lumix is superior to the Canon, and I recorded out in the open with a monopod while Finatic had his camcorder concealed under a t-shirt.