Geoffrey took Demelza out on a date but before he left the castle he would have checked up with his bros and had a chat. He would have been a bit weirded out by all the aurors but probably wouldn't really think too much of it.
He tries to wander away from the more busy areas and when he does he charms the fallen leaves into a huge pile so they can have a fun day of jumping in them. He also manages to (quite impressively) charm a leaf to curl up into a flower to which if asked, he confesses to spending a week practicing that. After he would have probably asked her if she was hungry or wanted to visit one of the shops to which he would happily accompany her.