Basically, you can make anything educational as long as you have a work sample to demonstrate its educational value. So, third party vendors put together field trip "kits" for you, which include the work samples that you turn into the charter. Then, the charter pays the third party for the cost of the field trip. People spend their own money to upgrade from a day pass to a yearly pass. This is one example of a charter vendor and their field trip kits. It's a big business in CA. https:/
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