Lateish: Dominic and Open
When it got to eight o’clock, Dominic decided he was bored of apparating to and from WWW with the portkey. He should have set up several, as he'd been planning to do until Seamus reminded him that unauthorised portkeys were illegal. Instead, he made one last trip to George's shop and placed a charmed parchment on the door. It read 'Party guest? What's the password?' and, when given the appropriate word, would change to say 'Apparate to The Roost'. It wasn't quite as mysterious as Seamus's original plan, but most people who were going to attend were already at the party, so Dominic didn't feel bad about his decision.
On apparating back to the Roost, he interrupted Seamus to ask for a sidecar - his first drink of the evening. He'd been refraining until now, not wanting to splinch himself. Drink safely in hand, he moved over to the wall of pictures, most of which he'd taken himself but some of which were reproductions of genuine 1920s work. "What do you think?" he asked.