The families of each champion had been invited to watch the first event. Albus contacted the Weasleys to fill in as Harry’s  surrogate family, and Arthur had kindly extended the invitation to include Remus, therefore Sirius had been bristling about the house in anger for days. Remus sympathized with the man, but at the end of the day, he wasn’t going to pass up an opportunity to be in such close proximity to his witch. Grabbing a handful of Floo powder, he called out a goodbye to Sirius who was glowering somewhere upstairs.