I am thinking of booking this tour even though it is only 2 months away. There are still openings - as a matter of fact, it just says "Sign Up" which indicates to me that there are quite a few openings left since otherwise they would indicate how many seats are left. If I sign up, I'll need to make plane reservations immediately. Does Rick Steves cancel tours if not enough people sign up? How would I find out if enough people have signed up to make this tour a "go?" I'd hate to buy airfare and then have the tour canceled.
Also, have any tours to Bulgaria taken place this season so far? I haven't read any trip reports and there are no scrapbooks since 2015. Anyone else going to Bulgaria this season?