Some ukulele festivals (like Reno and the Wine Country Ukulele Festival) have workshops and instruction, while others (like NorCal) don't. All the ones I've been to have ongoing performance venues and vendors. Some, like NorCal, lean more toward Hawaiian music, while others don't.
Now that you've been to the NorCal festival, did you have fun? If you did, then your decision sounds like a good one. I'm hoping that the Reno and Norcal festivals are on different weekends next year.