I made this video to help players earn some Hunter masks;

https://youtu.be/pNugUuIAurI
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There are 4 "flag" to pick up and raise at the poles in order to spawn Divide;
Can be done in night time (21:00 to 06:00);

0:00 to 1:50 / Turning on generator
1:50 to 3:04 / Flag #1 (Waterfront CP supply room)
3:04 to 6:28 / Flag #2 (Pier 26 area)
6:28 to 8:18 / Flag #3 (Celebration Hotel CP)
8:18 to 9:48 / Flag #4 (The Food Bank safehouse)
11:52 to 14:16 / Raising the flags at the poles
14:16 to End / Turning on generator again (Hunter Fight)