What happens when the Rebbe turns 120?
יא ניסן #120 coming up....
Your saying everyone will continue doing what their doing....
It's kind of the last opportunity to get down the tree for some.
I'm not quite sure what you're asking in the OP or referring to in the follow up.
If you learn the Rebbe's Torah, you find that every day has special significance. Each Yom Tov that came around was the most important Yom Tov of the year. Every anniversary, be it a birthday, Yahrtzeit, chag hageulah, or other was a uniquely special day that needed to be taken advantage of. Every milestone has special significance. 20 years, 40 years, 70 years, 100 years, etc.
So shnas 120 is a momentous day with huge significance. No chassid would want to remain the same, but to improve in any number of areas.
As for climbing down trees, I've never heard of that mivtza.