Fourth Annual Quahog Day on June 20th! The 4th Annual Quahog Day is coming up on Wednesday, June 20th at The Skipper Restaurant in South Yarmouth! Once again, the Cape's official Quahog Doug will come out to predict how many weeks of Cape Cod beach weather lie ahead. The ceremony will kick off shortly after 2 p.m., and a celebration bash will follow at The Skipper. To learn more about Quahog Day - and for a peek at the Quahog Day commercial spot currently running on WCVB-TV Boston - visit QuahogDay.com!