ISB ~ Luke 22 v1

the feast:The celebration of Unleavened Bread and Passover took place together in the spring (Lev 23:4-8; Ezek 45:21), when thousands traveled to Jerusalem to observe the festival as a nation (Deut 16:1-8). Passover commemorated Israel’s redemption from Egypt and looked forward to an even greater deliverance in the future (Ex 12). The feast was celebrated with a sacred meal of lamb, wine, herbs, and bread. Unleavened Bread, which began on the same day as Passover and extended for another six days, was a time when no leaven or yeast (symbolic of sin, 1 Cor 5:8) could be eaten among the Israelites.

See topical essay:When Did Jesus Celebrate the Last Supper? at Jn 13.