00-00-0000 An instance of divine providence? VIRGINIA ROHAN Date: 12-16-2002, Monday Section: ENTERTAINMENT Edtion: All Editions.=.Late Edition. Early Edition "Providence" began with a wedding, and the NBC drama may end - this week - with nuptials. Friday night's two-hour episode (8 p.m.) was supposed to be the grand finale. In late October, NBC announced it would be wrapping up "Providence" on Dec. 20, after a four-year run, with a supersized bow. On-air promos heralded the "series finale," but, as you may have noticed, the network has backed off the word "...