Calumet Beautiful Lake Ossipee at Camp Calumet Calumet Lutheran Camp and Conference Center is located in Freedom, NH, on the beautiful shores of Lake Ossipee. Purchased in 1960, Calumet has been serving as center for ministry to young people for 45 years. Calumet is for kids and adults and seniors and singles and church groups and families and the developmentally disabled and all sorts of other people. There are Lutherhostels and senior van trips and moms' weekends and backpacking weekends and youth events. And they happen ALL YEAR ROUND. Learn more about Calumet!