Upcoming Events using Campaigns Search

What I thought would be a simple saved search has yielded no results, even though there are campaigns that should fit in the criteria.

Using Campaign Search, I set the criteria as follows:

Channel = Event
Category = Forum/Tradeshow
Start Date = Within Next Four Weeks

I have three campaigns that fit that criteria yet they are not showing up in the search. I've looked everywhere in the campaign record to find out if I'm using something other than what is in the campaign and can't find anything.

What am I missing?

thanks,
j