Talk:Tanks for the Memories/@comment-26881975-20150814045036/@comment-5879304-20150821055601

in fact if you watch the show closely only a year has past since the 1st episode

Friendship is Magic, part 1  (season 1 episode 1) dealt with the Summer Sun Celebration

Princess Twilight Sparkle - Part 2 (season 4 episode 2) dealt with the Summer Sun Celebration and Princess Celestia states that it was the 1st one since her sister's return (as seen in Friendship is Magic, part 2)