1. An event that is scheduled, predetermined, or immovable in time and cannot be changed or rescheduled
The wedding is a fixed event on the calendar, so we cannot postpone it.
O casamento é um evento fixo no calendário, então não podemos adiá-lo.
2. In event planning or project management, an occurrence with a set date and time that is not subject to modification
The conference is a fixed event scheduled for June 15th.
A conferência é um evento fixo marcado para 15 de junho.