Win or lose, Moscaritolo said Romney’s party could generate up to $12 million in direct spending on hotels, restaurants, and transportation, and up to $20 million in overall economic impact, which could just about offset the losses the city’s tourism and convention sector suffered last week during Hurricane Sandy. Hotels across the city are at more than 90 percent occupancy Tuesday thanks to the Romney fete, along with the national attention drawn by the Scott Brown and Elizabeth Warren Senate race.