Aniversary vs major opportunity

So next week is mine and my boyfriends 2 year aniversary, I'm looking forward to it (well I was) as he said he would plan it all as I did last years. 
My boyfriend is really into a certain type of music and has the opportunity to be on a video with an artist with 2million viewers. 
However this recording takes place on the same night :( 
He tells me not to worry because he won't go but I feel really guilty because I know it's really important to him and I know he won't be completely into the whole aniversary because he will probably be sitting there wondering what if.
But I know if he did blow me off I'd be so pissed off with him because it's our day? 
What should I do ?