Serene state of mind

I decided to visit a live bar somewhere around Sakai-Higashi again since the end of March.
I asked if I could visit my friend for a live party on Jun. 10, the second Sunday in June.
But he told me that the live party is on the second Saturday, not Sunday, from June- so not 10th, but 9th, June.
Besides, I had to make reservation to perform there; it's not free-for-all.
Anyway, I asked him if they let me perform on Jun. 9: The data does not matter.
The theme of this stage? What I am planning to do? -I'm going to tell on the day in question.
However, some people would find out immediately from the dates AROUND Jun. 9.

◆ :Ready to place translation depending on request