There's a certain risk in sending this particular class of students on field trips, and Ponyville's school board is tired of seeing all of the disaster odds come through. So if the kids want to visit the Autarky Magic Center, then they're going to provide the security deposit. And that money can only come from one source: the classic school fundraiser. The corporate adults providing the 'chocolate' even promised a personal reward for selling lots of the stuff!
Cheerilee is putting Diamond in charge of the sales brigade.
The adults are going to regret that.
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