If you look here...
http://www.sonispherefestivals.com/
...it looks like a rotating bunch of bands, depending on the show you attend. While I didn't check every venue, I didn't see much in the way of other thrash bands. Then again, I wouldn't call Alice In Chains or Stone Sour "undeserving garage bands".
It's mostly festivals, so there's gonna be a sh*t-ton of bands playing.
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I used to be with it, but then they changed what "it" was. Now what I'm with isn't it, and what's it seems weird and scary to me, and it'll happen to you, too.