The book store that specializes in theater and entertainment industry books and plays in NYC. The Drama Bookshop https://www.dramabookshop.com . If you are in NYC check there website out because they often has unique speakers at the bookshop. If you are looking for something special that you cannot find, give them a call.
For Commedia dell'Arte, Neutral Mask and custom masks for the classroom or professional use; which is my company www.maskarts.com or call directly at 212-255-2882 Mask Arts Company. Base in Manhattan NYC. In the Commedia dell'Arte sections of the website there are list of articles on Commedia dell'Arte and theater, Commedia dell'Arte character descriptions and more. One of the only place in the United States to get Performer Slapsticks, it looks like a stick, yet masks a big whack, with no springs. Took decades to come to this Performer Slapstick design. There are also some videos.
For recommended books on Commedia dell'Arte some in print some out of print. https://www.maskarts.com/booksrecommenedoncommedia.htm
Workshops on: mask making: Commedia dell'Arte intensives: Neutral Mask Metaphysical Mask Lab: Creating Original Material - Beyond Devised Theater: Mime - Movement – Rhythm: Custom Leather Clown Nose Making workshops:
Mask Arts Co Teaching Coaching Directing Playwriting Acting
Workshop are for professionals, students, and teachers and give a variety of skill, history and exercises theater teachers can use in the classroom.
Be sure to include Real-World Theatre Education for a season-by-season walk-through of what to expect from job search to summer vacation, the "context" of teaching and directing in a school setting: dealing with casting blowback, field trip and fund raisers, competing for enrollment with other electives, the politics of running a theatre program & 26 downloadable templates to customize (avoid reinventing the wheel) from sample curricula to tech rules to post to a form for a student to request a college recommendation. Lots of anecdotes to entertain/instruct and "what-if" scenarios to discuss. It's available through EdTA, Amazon, SamFrench, Pioneer...and the link above.