Thanks for member @Matthew_Hoinkes and to the owner of the Grapevine Foundry, Linda Lewis-Roark, we were able to do a Raku firing today.
This was a proof of concept experience, not a class. A lot was learned, and I take the blame for any mistakes made. We got one really excellent result, meaning the glaze did exactly what it was supposed to, several good results, and a few examples of what not to do. Lol
Expect to see this field trip experience added to the list of Foundry classes in the near future.