I had planned to go but have been thwarted, unavoidably.
If you are able to attend it will send an almighty message to our Dear Leader and his bunch of associates.
It starts at 2pm and finishes at 5pm - this is a wonderful chance to proclaim the sanctity of marriage between one man and one woman.
After all, if David Cameron gets his wicked way, we could all end up in the same boat as this clip shows:-
And a message from the organisers: