A relatively light upcoming week in shows still has some fine musical happenings to help you kill time while waiting for the apocalypse. And curiously, all on the waterfront. Harbourfront's excellent summer festival schedule continues Friday through Sunday with T.O. Twang, billed as "Toronto's first and only alt.country festival". In addition to musical performances from such excellent acts as The Sadies, Carolyn Mark, Billy Joe Shaver, Elliot Brood, Luther Wright & the Wrongs and The......