If one leg of your parlay is cancelled, most sportsbooks will remove that leg from the parlay and recalculate the odds with the remaining bets. If all other legs win, you'll get a reduced payout based on the adjusted odds. However, if the game has been rescheduled to be played in a short period of time, a few days or weeks, then the sportsbook may keep the bet active until the game is complete. As always, be sure to check relevant terms and conditions if this is important to you.