I checked out the Fleet Center calendar page, along with the Celtics and Bruins schedules, and there really isnt enough dates in March for Boston, other than a quick March 22,23 and 24- assuming they can get the stage ready in less than a day!
And that wouldnt allow for any practice time in the arena itself.
Even in Miami-American Airlines arena is getting booked up in March-
who knows, maybe there wont be a hockey season anyway.
I assume the tour will have to work around the NBA and NHL schedules for most arenas.
May or June is more likely in Boston since the season ends by then, and any playoff games can be scheduled around the concert dates.