Guests take in the Mystic River during an invitation-only party at Encore Boston Harbor Thursda …

Guests take in the Mystic River during an invitation-only party at Encore Boston Harbor Thursday, June 20, 2019. The $2.6 billion, 671-room resort opens Sunday at 10 a.m. local time. (K.M. Cannon/Las Vegas Review-Journal) @KMCannonPhoto