The Nassau Inn is the only hotel that is within walking distance of the workshop.
The phone number is 609-921-7500. I was not able to get a special rate so you will need to pay the full market value.
A low-cost option in town is the Erdman Center, Princeton Theological Seminary's boutique meeting and lodging facility is located at 20 Library Place, Princeton, NJ, directly across the street from the Seminary library and about a five-minute walk from the train station, Princeton University's campus, and downtown Princeton. Guests receive free internet access, daily housekeeping, and complimentary coffee and tea. See Erdman Center for more details.
Room with single bed and shared bath (shared with one other room) - $55 per night
Room with single bed and private bath - $65 per night
Double Room - $80.00 per night
Suite - $85.00, Family Suite - $95.00