The fee is charged by the TCF, not MARCH, for an exhibitor access pass.
The value of the pass is to allow a person to enter the flea market before
the event to set up.
Each person that "appears to be selling" at the flea market could
potentially be asked by a TCF worker patrolling the grounds to show their
If you plan to just sell one thing you can probably bring it into the flea
market without a pass, and just let someone with a pass do the actual
selling for you.
There MAY also be a case by case request for a MARCH donation, based on