AG Opinion No. 7120
December 4, 2002
A municipal outdoor recreation park does not, by itself, constitute an "entertainment facility" within the meaning of section 5o(1)(f) of the Concealed Pistol Licensing Act, and thus is not a gun-free zone as established by that statute.
http://www.ag.state.mi.us/opinion/datafiles/2000s/op10195.htm
This is not what the OP asked. The question concerned the definition of "theater", (MCL 750.234d) not "entertainment facility" (MCL 28.425o).
Does the OP have a CPL? IF the OP does have a CPL, the restrictions found in MCL 750.234d are not applicable to the OP.
So, the OP should clarify whether he/she possess a CPL and if the questions stem from the wording found in MCL 750.234d
From the way the question was worded, I'm assuming the OP does not have a CPL.
Therefore, in order to avoid any possible legal issues....the definition of " bank" would include "credit union". An outdoor theater would be a considered a "theater". The AG opinion regarding Entertainment Facility above centered on the fact that a "facility" denotes a structure.