Police and fire crews were called to the Asticou Inn just after three o’clock, Monday morning.
Once there, they found a large party tent on fire, and a man with a gas can standing in front of it.
Police arrested that man: 25-year-old Matthew McAfee.
The flames were put out quickly, but audio equipment inside the tent was destroyed.
Police say McAfee has been working at the Asticou for the past several weeks.
The tent was being used by the Lexington Seminar, which is holding its yearly gathering at the inn.