Hahne’s may be going down tomorrow, but downtown Montclair’s Christmas tree went up today. Secured in its place of honor at Church Street and North Fullerton, the hulking blue spruce debuts more than a week ahead of Thanksgiving. The rest of Church Street as well as Bloomfield Ave have been wreathed, with most local store windows reflecting visions of sugarplums. If strolling downtown isn’t enough to get you singing deck the halls, the folks at Van Vleck House are doing just that, today through Saturday, with their annual fundraising festival of trees, weaths and topiaries decorated by talented volunteers and local celebrities. Planned contributions include a tree adorned with cosmetics by makeup mogul Bobbi Brown and a tree decorated with miniature bulldozers by Steven Plofker. OK, maybe we’re making that last part up, but it would be cute, wouldn’t it?