Coming up this fall: the outstanding Follow the North Star program (weekends in November), the Traditional Arts and Arms-Making Workshop (Oct. 11-17) and a variety of adult classes, such as pottery, blacksmithing and weaving.
You can also attend one of the museum's On the Farm Experiences, which can last for a day or an entire weekend, depending on your tolerance for outhouses and chamber pots.
If you haven't attended Follow the North Star, make that your first priority. The experience, which re-creates the journey of an escaped slave (with you as the slave), is unsettling and incredibly powerful. I reviewed the program earlier this year, and I can't recommend it enough.