It would have been odd if he'd owled Simon, so A showed River how to send a message by owl.
((The text of all the owls is the same))
River and I have made peach pie and peach ice cream. If you come to the Ravenclaw common room I will share some with you. I would be very happy if you came.
A
It had turned into a larger gathering than A expected, so they brought the pie and ice cream (the house elves had provided a large quantity of vanilla in addition to the peach they'd made) into the Ravenclaw common room.
((OOC - Open, but there's only enough pie for the invitees. Ice cream, however, for all! Party post!))