big day

Noun

 * 1) The day of one's wedding.
 * 2) Any day on which something significant or momentous happens.
 * 3) A birding event in which teams compete against one another to see as many different bird species as possible in a certain area over the course of a day or part thereof.

Translations

 * Danish:
 * Finnish: suuri päivä, tärkeä päivä
 * French:
 * German: großer Tag
 * Italian: gran giorno
 * Swedish: stora dagen