You'll hate this answer, but that's up to you to decide sorry! If you think it's enough to fit the theme then leave it, otherwise change it however you like. It wouldn't be much of a competition if I helped people too much xD
I posted this 'Tons of fans have also celebrated this movie as the one that will bring Marvel to fame throughout the globe. Seeing as it's a comic book adaptation to rise to the 3rd most successful movie of all time, we can only imagine what else Marvel has in store for us in the next couple of years.'
Honestly I couldn't really pick up on a celebrations theme... I assume you were meaning for "Thanks to this movie, Marvel has seen their fandom grow very big and has sparked a huge interest in the series too. This top grossing movie of 2012 has also rebooted The Hulk movie with a sequel thanks to Mark Ruffalo's incredible performance, and in 2015 we're getting the sequel to The Avengers!" to be implying celebrations? I reckon if you just reword it slightly to include the word "celebration" and give a little more info about why this is a reason to celebrate then it should be perfectly fine :)
As long as you explained why you considered it to be something worth celebrating then yes, that'd be perfectly fine. You can interpret the theme in any way you want, be it the film/song was the best of it's kind, the film/song was about a celebration, the film/song could be used at a celebration, etc etc, as long as you include celebrations in there somewhere. Hope that helps! I know it's a bit vague, but that's just because there's countless ways you could include it so it'd be impossible to list them all haha.