Vietnam Moratorium Day was observed quietly in various parts of the Vineyard Wednesday - by children building peace symbols on the Menemsha sand; worshipers at a morning Eucharist service and an evening prayer service at Vineyard Haven’s Grace Episcopal Church; a solemn handful who listened to the names of Massachusetts’ war dead being read, high school students attentive to blues-rock music and a dozen who shivered after dark with candles in their hands outside the West Tisbury Congregational Church,