You'll be asked to enter your personal information to verify your identity. To place wagers with Caesars Sportsbook in the Bay State, the first step is to go to the Caesars Sportsbook sign-up page on the desktop web page or the Caesars' mobile app. You have to enter a Caesars Massachusetts promo code BOOKIES1000. The Caesars Sportsbook Massachusetts promo code delivers $1,000 in bonus bets by placing an initial wager of $10 on Caesars Sportsbook. How To Claim Caesars Massachusetts Promo Code