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do you give them the worms the same day? Is there any problems with putting the worms in immediately? How do you let people know what to bring for a bin--
Workshops can work any way you want.
You can provide all the materials and include that in the price of the workshop.
I have done workshops (like with Home School groups) and tell them to provide 10 gallon Rubbermaid Roughnecks (2 per family) and then I just do the presentation and bring however many worms each family wants to start with.
All workshop participants go home with a completely set up bin, with instructions of how to feed.