Seen an ad for Blue Man Group in Sacramento at the Arco.

Go to Pollstar, and for the next three months they are in Japan.

Do a Ticketmaster search, for the next three months they are in Vegas.

Do another search on a ticket site, they are everywhere but Sacto for the next 3 months.

Google, Blue Man Group Sacramento,,,yup in Sacto in January on the 18th.

How many are there? What is it some franchise or something, like Quiznos???

Pretty sure just 3 different sets of guys now. But, started with the original three, and they made it into a production company. One of the first things I noticed about them, was during Television shows, pictures(a friend of mine is a big blue nut, she met them a bunch of times and the faces were all different in the pictures, from show to show). Cirque de Soleil, has a rotating troope travel crew as well, meaning same dates different places. Not for certain, but, I believe the Transsiberian orchestra does as well.

they are also performing at Universal Studios every week, at CitiWalk

So far I've seen Blue Man in New York City and at the Venetian in Vegas, there's one for sure in Boston and Toronto and Universal City, Florida. The one that you see traveling around is the group that's doing the "How to be a Megastar v2.0" tour. The first Blue Men are pretty much just running the PR and marketing now and they're based out of NYC - as well as new material creation, of course.

Per city, there are also multiple "Blue Men" groups - I saw the show twice in Vegas and it was a different set of people each time. It's not a franchise, but more a multiple troop organization is all - either way, I'd see them again in a heartbeat.