From the NHLPA release:
24 PLAYERS ELECT SALARY ARBITRATION
TORONTO (July 5, 2016) – Twenty-four players have elected salary arbitration:
The deadline for club-elected salary arbitration notification is July 6, 2016, at 5 p.m. ET. Salary Arbitration hearings will be held in Toronto from July 20 to Aug. 4, 2016.