It's Facility Maintenance Fee, a fee that goes to the upkeeping
of the stage, microphones and such.
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Failure to pay the maintenance fee on a timeshare unit can
result in late fees and penalties. Going to long without paying the
maintenance fees can result in being turned over to a collection
agency.
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"Several websites offer preventative maintenance software for a
fee, which includes support service. Choose a software suite that
attends to your needs in preventative maintenance."