well, it would be very easy to say 'Eighth of May' instead of 'First of May' in the song I quoted above. it's a nice tune. With a minor re-write, it could be an appropriate song for such an event.

Let me take a stab at it:


When I was small, and christmas trees were tall,
We dreamed of love while others used to play.
Don't ask me why, as time has passed us by,
Our dream of love has brought us here today


Now we are tall, and christmas trees are small,
And soon we'll dance the night away
Because you and I, our love will never die,
And this we vow on this Eighth of May.


That's the best I can do right now.. I'll try and come up with more verses later.