Translation:The eighth of March is the concert date.
"ʻO ka lā ʻewalu o Malaki ka lā ʻaha mele." DL doesn't accept "The concert day is on the eighth of March.
Yet, on a previous lesson, it accepts:
ʻO ka lā ʻehā o Ianuali ka lā hōʻike. "The presentation day is the fourth of January."
Same sentence structure. Different month,day and event is the only difference I can see.