May 11, 1999 is the 300th birthday of Plainfield, CT.. There are several activities planned through the end of the year. If you would like more info, you can call the Plainfield, Town Hall (860) 564-4071.For those who are just planning their summer trips; there will be a Colonial Encampment July 10, 199 from 10 am to 9 pm , and from 10 am to 4 pm on July 11, 99. Plainfield is located on Interstate highway 395 that runs the length of Eastern connecticut. Our neighboring towns are Griswold (jewett City), Canterbury, Killingly (Danielson), & Sterling CT. Plainfeild is 18 miles from Putnam or Norwich CT., and abt. 35 miles from New London, CT. Bertha Hall Plainfield, CT.