Several young adults from St. Gall Catholic Church are on a mission to get to Rio de Janeiro and meet Pope Benedict XVI during World Youth Day in July.To help get them there, the church is hosting a Fat Tuesday Mardi Gras dinner dance 5:30 p.m. Tuesday in the pastoral center."Every two to four years young adults from around the world gather and are inspired by concerts and worship and speeches," said Marina Hedwall, director of youth formation. "While there, we participate in a Mass given by the pope. This year it's Pope Benedict XVI."In 2011, Father Paul McCollum traveled …