Visitors to the East End often giggle when someone mentions the Ladies Village Improvement Society in casual conversation. Sounds like a flashback to prewar Britain: Do the ladies specialize in marmalade boiling, bootie knitting, and the singing of patriotic songs? Of course you, dear reader, know better: East Hampton’s L.V.I.S. is a mighty institution that has for 123 years and counting represented the best of what a volunteer civic organization can be.