At the place we are going to on Sunday, there's going to be a hero show!
I heard there's going to be a hero show on at the place we are going to on Sunday!
There's going to be a hero show at (Aeon) on Sunday
「日曜日に行く予定の〇〇でヒーローショーやるって」= At the place we are going to on Sunday, there's going to be a hero show! / I heard there's going to be a hero show on at the place we are going to on Sunday! / Apparently they are holding a hero show at the place we are going to on Sunday! / There's going to be a hero show at (Aeon) on Sunday
ボキャブラリー
~って = apparently, I heard
~がある = there's going to be (未来の話だからgoing to beを使います!)
行く予定の〇〇で = the place we are going
日曜日に = on Sunday
hold = 開く、行う