BENEFIT: In support of international children's aid organization ONEXONE, Maple Leaf Gardens will be opening its doors to the public for the first time in eight years. The 2008 ONEXONE Benefit Concert will feature performances by Grammy Award–winner John Legend; the African Children's Choir; The Canadian Tenors; and the ultimate ambassador for children and strippers alike, Wyclef Jean. Maple Leaf Gardens (60 Carlton Street), 8:30 p.m., $150. THEATRE: Toronto burlesque troupe Les Coquettes are......