So many things to celebrate. You survived one hell of a week, for starters. And managed to get in some very heavy eye contact with the office crush in the process. So raise a glass. Because we’re officially instituting Champagne Fridays. And it all starts at Fizz Bar at the Westin Copley. Smack in the middle of the lobby, a half dozen massive leather couches and loungers await you and your entourage. A handful of bubblies are available by the glass (to toast a decent week) or the bottle (for an I-kicked-butt-at-my-job week). Plus, you can fortify with a brief list of nibbles like crabmeat poppers with chipotle mayo; a cheese plate with manchego, Brie, Stilton, and toast points; or mini lamb burgers with mint yogurt. Sip. Watch the beautiful people go by. Or order dessert and stay until the bar closes: The chocolate decadence will melt your heart. But then again, so might the crush. May as well bring him along and toast Friday together. Fizz Bar, Westin Copley Place, 10 Huntington Avenue, Back Bay (617-262-9600).