F. Scott Fitzgerald famously said that there are no second acts in American lives, but in the case of the characters in “The Christmas Schooner,” it’s the second act that brings them to life. Written by John Reeger, with music and lyrics by Julie Shannon, it’s a musical that explores the spirit of the holidays and the immigrant experience in America. It begins in 1881 in Manistique, Mich., as a family of Germans prepares for Christmas in America. The Stossels – Peter (Bryan Agee), Alma (Heidi Santiago), and their young son, Karl (Jordan Santiago) – have embraced American customs while still recognizing their German heritage, and while Peter’s stodgy father, Gustav (Gary Pierce), still clings desperately to Old World traditions.