The Tartan Specials will be playing The Ferry before the Scotland v Croatia friendly on March 26th, so if you're going to the game, drop by the Ferry first.  For the first time in ages, the Ferry is not 100% sold out in advance, so if you want tickets you can get them from Don (donbasta) on the Tartan Army Message Board.

Further information:

http://taboard.com/forum/index.php?showtopic=71616&st=0
http://www.tartanspecials.com