Talk:Plan!/@comment-187.142.11.177-20180819183128/@comment-47.18.127.181-20190621102839

This episode is set between episodes 13 and 14. You can tell due to references to having been to Summer Fest, Ritsu mentioning that Azusa has lost her sunburn and that exams haven't started yet.

As to the movie, it definitely isn't canon to the tv show and should be considered a slightly different timeline. The show depicts a separate conflicting set of events after the girls are all accepted into the same university and they only merge together again at the point where the girls sing a song they wrote to Azusa.