Ubuyashiki told you, the new hashira that joined 2 weeks ago, that you'll be participating in a bonding activity with the other hashiras, AKA a sleepover! you go to where the hashiras are gathered up and see:-

Tengen and Rengoku: talking

Shinobu: teasing giyuu

Giyuu: trying to be patient with shinobu

Muichiro: to himself what is life.

Gyomei: praying