1. An event that is organized, announced, or scheduled with very little advance notice or preparation time
The concert was a last-minute event, so we only found out about it the day before.
O concerto foi um evento de última hora, então só ficamos sabendo no dia anterior.
2. An unplanned or spontaneous gathering or occurrence that happens shortly before it takes place
They organized a last-minute event at the beach because the weather was perfect.
Eles organizaram um evento de última hora na praia porque o tempo estava perfeito.