Even before the Knicks traded Danilo Gallinari to Denver for Carmelo Anthony last night, the rumors had become so heated that the team canceled a charity event for Garden of Dreams with Gallinari and Momofuku founder David Chang scheduled for tonight at Chang’s Ma Peche. A handful of Knicks were expected at the cocktail reception for 80 fans, but organizers yesterday scrapped the event at the West 56th Street restaurant, fearing it would be overwhelmed by trade talk. The event will be rescheduled.