red-letter day

This was a red-letter day in the history of Liverpool's famous old stadium as the new top deck of the Anfield Road Stand was in use for the first time.

His 24 points - his highest tally in a Test match - included two tries, but his kicking, vision and communicative skills laid the foundation for Ireland's red-letter day.

Saturday was a red-letter day for the history of art in Southern California.

It was a red-letter day for Elizebeth, proof that she had lived up to her old dreams of achievement.

Normally he was a jovial man, with an impish sense of humor, but on that red-letter day he was clearly bummed.