Here’s a very interesting-looking workshop with Kerik Kouklis (I have it on good authority that his workshops are excellent):
Wet plate collodion, one of the earliest photographic processes, has been experiencing a resurgence of interest in recent years. This resurgence is primarily because of the beauty and uniqueness of the images created. In this workshop, you will learn how to create wet plate positive images (Tintype and Ambrotype) as well as wet plate negatives. Through a combination of discussions, shooting sessions and darkroom time, participants will learn how to incorporate this process in their own photography.
Cameras and wet plate holders ranging from 4×5 to 8×10 will be available for students to use. Students are also encouraged to bring your own view camera as well. This workshop is open to anyone with an interest in 19th century techniques.