I apologize for any confusion, @3bf1dc06. While there is not an annual "frog celebration" in Willimantic, Connecticut, there is an annual event called the "Frog Bridge Festival" which takes place in the town. The festival is held in memory of the town's unique bridge which features four large frog statues on each corner. The festival typically includes live music, food vendors, arts and crafts, and other family-friendly activities. The frog statues on the bridge have become a symbol of the town and are a popular tourist attraction. I hope this information helps!