With less than a week to go before the arrival of a Feb. 2 strike deadline, Las Vegas casinos are negotiating overtime with culinary and bartender unions to avoid a shutdown. Labor agreements were reached in November with Caesars Entertainment, MGM and Wynn, averting massive complications related to the Grand Prix race. Deals have also been signed with Palms, Westgate, The Strat, Mirage and Tropicana, but that still leaves nearly 25 properties unsettled, including Treasure Island, Circus Circus, Sahara, Virgin, Rio and all the downtown casinos. With the Super Bowl less than two weeks away, the odds favor settlement. The last strike against the casinos took place in 1984.