“Mamma Mia!,” the hit musical intertwined with ABBA’s timeless songs, brings the celebration of love, laughter, family, and friendship to the Racine Theatre Guild Friday, May 20 through Sunday, June 12.   On a Greek island paradise, Sophie is getting ready to marry her fiancé, Sky. To make her wedding day perfect, Sophie hopes and dreams that her father walks her down the aisle. The only problem? She doesn’t know who he is! After discovering secrets from her mother’s past, Sophie invites three men who could all be her father to the wedding.