Feast of the Passover
Facial types seem vaguely Jewish. All have walking staffs, girded up, wearing boots. The conical hat, I think, is supposed to designate the priest. These details conform with the biblical description of the feast:
And thus you shall eat it: you shall gird your reins, and you shall have shoes on your feet, holding staves in your hands, and you shall eat in haste: for it is the Phase (that is the Passage) of the Lord. (Exodus 12:11)
Art of the period made no attempt to be historically accurate, and even if they tried, lacked detailed knowledge. This shows an earnest attempt to stick to the narrative.
Note the booted leg just stepping into the picture frame.