Harry and Ginny's arrival
Al checked once more that the Colloportus spell on the front door was lifted for the time being and that the Muffliato normally blocking the Muggle road noise allowed for the knock to be heard but the brief knock on the door wouldn't trigger the Intruder Charm into screaming the house down.
He released his breath. Now that the regular dinner preparations were settled, he was all prepared for the rest. Whew.