Ah, the time-honored "1 extra ticket, but more than 1 extra friend" scenario. It's a premise that's been done before, but that doesn't mean it won't be good. This premise produced one of my favorite Rocko's Modern Life shorts, "With Friends Like These"; so sometimes it's not what you have, but what you do with it that matters.
As always, I'll wait until I've seen the episode before delivering commentary.
EDIT: Just seen it now, and thankfully this show still has yet to disappoint. The plot was predictable, but the execution and characters made it entertaining. Who would have ever expected a Benny Hill reference in a My Little Pony story? This one reminded me of Foster's, and in a good way. It's also worth mentioning that there was no villain in this episode; again, I like it. It's good to see that this show can run on purely comedic stories and not have to rely on the whole 'good VS evil' narrative every time. It gives the show more variety.
I'm really liking what I've been seeing so far. I hope Ms. Faust and team can keep up the good work.