Apology...

It was supposed to be a happy thing...

But out of my expectation (probably all of us), it turned out badly...

No one is to be blamed for this incident...

Or...

Maybe some might disagree with that...

I think, I should take the responsibilty for this...

As I was one of them...

I apologise for causing the consequences...

I apologise for embroiling all of you into this...

I apologise for ruining the birthday boy's big day...