So basically, the events are not gone at all, they just now live in their own place rather than the main loop. We do have a thread on the forum (somewhere) on how to add them back to the main loop if that is important.
Any reason you are not using pretty permalinks? You will have much much better seo if you do. There is a known bug with events for sites not using pretty permalinks that we will tackle in 2.0.2 ( a few weeks).
To find you events calendar just add it to the menu (easiest approach). admin > appearance > menu > events panel > check "events". If you don't see events click on the screen settings tab and you should be able to turn it on in there.