an experience that makes an impression

Rashi writes that the gathering of  וַיַּקְהֵל מֹשֶׁה אֶת⁠ כׇּל⁠ עֲדַת בְּנֵי יִשְׂרָאֵל took place למחרת יום הכפורים, כשירד מן ההר.  When that gathering finished, the Torah reports וַיֵּ֥צְא֛וּ כׇּל־עֲדַ֥ת בְּנֵֽי־יִשְׂרָאֵ֖ל מִלִּפְנֵ֥י מֹשֶֽׁה.  It should go without saying that when Moshe was done speaking everyone went home.  Why mention it?  (See this post where we discussed this.)

R' Avraham Shapira quotes Chasam Sofer that the point the Torah is trying to make is that in this case it wasn't just stam you went home, business as usual, like you come home from the grocery store or a day of work. In this case it was clear on the faces and in the behavior of the people that they had come מִלִּפְנֵ֥י מֹשֶֽׁה, they had just experienced something important, something that made an impression. 

So too when we come to למחרת יום הכפורים, the experience of Y"K should leave it mark, and there should be an impression left even as we depart from the kedushas ha'yom.