The Baseballs will be at Cumbre Tajín festival in Poza Rica, Mexico on March 20. The festival site has confirmed this date but The Baseballs themselves haven't mention about it anywhere. If there will be one show in Mexico, I am sure the guys will do some promotion or some other things in Mexico/America. Long way to go for one show. Hopefully there will be more news about this visit in Mexico.
There is also another new date on Basti's Birthday (April 9) in Warth-Schröcken, Austria. More information here: http://www.warth-schroecken.com/en/detail/ostermontags-openair-mit-the-baseballs-in-warth-schroecken/