Hey there Ben. Thanks for the note here, and my apologies for taking a while to get you a response here – my colleague who was monitoring this forum is unfortunately no longer with us, and as a result we’re just now catching up on the threads missed since her departure. (We’ll be hitting this forum again on a daily basis starting today, so if you post any follow-ups we’ll get you a response with haste).
We actually didn’t launch Events 2.0 until November of 2011, and I see that WordPress 3.0 launched back in June 2010. As a result it’s quite likely that even the first 2.0 release would give you problems on that build of WordPress. Did you ever have Events Calendar PRO 1.x? The last version we ended on before launching 2.0 was 1.3.3, which I’d be happy to send you for free if you wanted to use it. (Just know that we unfortunately will not be able to provide any support on it).
If you want to take that route, shoot me an email (pro /a/ tri.be) with a link to this thread and we’ll get you what you need. Cheers and thanks for your patience so far.