First of all, It is impossible to play episode 6 without completing episode 3.I can only tell you what happened. Only the first exhib event fired, I tried for 10-20 consecutive nights, and nothing happened. Also yes, I didn't do quest 3, I went to quest 4, 5 and 6, and only checked back after those in the log.
To play episode3 go to city hall at night and knock the door
To play episode 6 go to healhouse and take healing until the quest appears.
To play episode 7 go to bluemovers.