The Harvard Square Chocolate Festival is a three day event with a free sampling on Saturday, January 25, 2014 from 1-2pm outside 18 Brattle Street. It is only from 1-2pm. It ends at 2pm, or when the food runs out, whichever is sooner.
We arrived a bit later than we planned, a bit after the start time, and found the end of the line all the way past Otto. While it moved faster than expected... we ended up leaving chocolate-less as, still yards away, we were informed that it was 2pm and they were now closed. Sadness.
Tip: Go early or go home.