It’s traditional to offer musical offerings (particularly sacred ones) in sancturaies, actually. Though a proper respect still ought to be used and the event is ideally free. Also, it’s recommended to move the Blessed Sacrament to another place, if possible, at that time in order to maintain appropriate dignity and respect for the LORD. By extension, I don’t think that there is an inherant problem with having certain other events like this. Though, again, some prudence needs to be used as to what should or should not be done as well as how to maintain a proper respect and devotion.