You say he doesn't want to make a weekend of it with you, is it any wonder, you are not having a romantic weekend for 2. You are meeting up with 20 something other people to rave about Mika! Not the typical wedding anniversary now is it!
I'm not meaning to cause offence here, but with me, my family come first, always. You can still have a great time with us on the Saturday.
Step back for a minute and put yourself in his shoes, that's how I TRY to live my life, doesn't always work, but, if he put himself in your shoes, he'd have a pretty good case for you not going, as you have all the other gigs and people to meet too!
Anyway, that's all I should say, but you should really think about it Sara, this fan club could have fizzled out in a few months, he'll still be around......