playtesting

I got "failed reading message svc_ServerInfo from unknown." in the console before the demo for my map being playtested on the US server just crashed. It looks like there was some sort of error in the demo and it was cut short to 20 seconds, only having 2.4 mb of size. Does anyone have any idea...

I've started making some basic maps, and I'd like to participate in playtesting events. Is there a place that lists all the times and servers that it will happen? Thanks.