ἀλλὰ ἐνδύσασθε τὸν κύριον Ἰησοῦν Χριστόν, καὶ τῆς σαρκὸς πρόνοιαν μὴ ποιεῖσθε εἰς ἐπιθυμίας.
This is a great declaration and imperative! Paul has lots of momentum as he anticipates the fulfillment of the eschaton; and his idea of welcoming Christ is to reject contemporary forms of celebration and to embrace all of Jesus via the Spirit. Such an embrace summons our faith in God, along with an ethic to love your neighbor as yourself (13:9).
None of this happens behind closed doors.