Slip on your scariest ghost, witch or skeleton costume and head on over to Matadora on Halloween night for an evening of spooky treats and haunted brews. From 7:00 to 11:00pm, the Woburn steak and tapas joint will be serving up specials and festive cocktails in honor of the spookiest day of the year — and, for those who come dressed-up, you’ll get a chance to win a prize if your costume beats the rest. Entry into the event is free; click here to register and guarantee a spot, if you dare…