For folks located in the Bay Area, there's a promo code for free tickets to the Bay Area Travel & Adventure Show in Santa Clara. Tickets are usually in the $10 to $15 range - I personally don't think it's worth that much to go, especially when booths are there to sell you stuff. However, for free tickets, it's a nice way to spend a few hours of your weekend. Features Rick Steves as one of their keynote speakers and he'll usually spend some time at the end for autographs/selfies. The layout is similar to a conference/job fair with schwag to get - lots of reusable shopping bags to grab. Lines can be very long when they first open, but it moves quickly. Parking has been free at the Santa Clara Convention Center.
Link to tickets below - free with promo code TZC18. Not sure if there's a limit, but I was able to get more than one.
Promo code TZC18