Well, if you know the scriptures, then what I said should have jogged your memory of specific incidents recorded. Here are some examples....
Celebrating a Jewish feast....
Mark 14:12 On the first day of matzah, when they sacrificed the Pesach, his talmidim asked him, "Where do you want us to go and make ready that you may eat the Pesach?" 13 He sent two of his talmidim, and said to them, "Go into the city, and there you will meet a man carrying a pitcher of water. Follow him, 14 and wherever he enters in, tell the master of the house, 'The Teacher says, "Where is the guest room, where I may eat the Pesach with my talmidim?"'
Blessing of the bread and the wine.
Mark 14:22 As they were eating, Yeshua took bread, and when he had blessed, he broke it, and gave to them, and said, "Take, eat. This is my body." 23 He took the cup, and when he had given thanks, he gave to them. They all drank of it. 24 He said to them, "This is my blood of the new covenant, which is poured out for many.
Attending a Jewish wedding.....complete with water pots for cleansing....
John 2:6 HNV Now there were six water pots of stone set there after the Yehudim' manner of purifying, containing two or three metretes apiece.
Attending Sukkot....
John 7:1 After these things, Yeshua walked in the Galil, for he would not walk in Yehudah, because the Yehudim sought to kill him. 2 Now the feast of the Yehudim, the Feast of Sukkot, was at hand. 3 His brothers therefore said to him, "Depart from here, and go into Yehudah, that your talmidim also may see your works which you do. 4 For no one does anything in secret, and himself seeks to be known openly. If you do these things, reveal yourself to the world." 5 For even his brothers didn't believe in him. 6 Yeshua therefore said to them, "My time has not yet come, but your time is always ready. 7 The world can't hate you, but it hates me, because I testify about it, that its works are evil. 8 You go up to the feast. I am not yet going up to this feast, because my time is not yet fulfilled." 9 Having said these things to them, he stayed in the Galil. 10 But when his brothers had gone up to the feast, then he also went up, not publicly, but as it were in secret.