Initially, I went because I thought, "If there's a Tokyo Blade Fospot, I have to go!!" But... I'm so ashamed of my thinking!

In a word, "I was moved to tears by the passion and love of everyone involved in the anime [Oshi no Ko]!!"
Director Hiramaki-san, Nakatomi-san, character designer Hirayama-san, Iga-san, and others... and the voice actors each wrote down the scenes that left the biggest impression on them on their respective stages.

That was the most memorable experience for me.

As for the panels, the one depicting the "This is the Beginning" scene was fantastic.

I went to the Oshi no Ko Experience Exhibition! | Poppo's post