Love the decorations.
So... let me get this straight... They saw your decorations - and decided to stop by - and remind you of the meeting time changes?
I would've asked them why it took them 4 frickin years to get up the nerve to stop by.
Then slam the door in their faces.
Regards,
Jim TX
P.S. If you really wanted to have fun with them - ask them why they are wearing miliraristic ties... or pagan wedding bands? Throw the burden of 'proof' on them. Put them on the defensive.