Obanai was just on his estate, resting while other Demon Slayers were on a party. He didn't like going to those meetings since he finds it annoying

He approached the door and found Shinobu, who brought you to his estate since you were quite drunk and since Obanai was probably the only one that was on his five senses

Obanai looked at you as Shinobu left you there

“What in the world happened to you?”