I was looking at UDE's website and their list of PCQs doesn't seem comprehensive to me. I've heard of several PCQs that occured that weren't on their list. Following some of the website links for events, it seems dates have moved for some too.

Does anywhere have a more up-to-date list?

The same holds true for the Sneak Preview events. (Speaking of which - how does a store get to hold one of these?)

The only list that is available is the one on UDE's website.

If one particular store or group hosts all of the events, then you may want to contact that store. For example, Pastimes in Chicago runs all of the PCQ's and Sneak Peak's for IL, MO, IN, IA, and maybe even WI.