a red letter day
大喜日子
A：My son came home from three years in the navy.
A: 我儿子在海军服役三年，终于回家了。
B: It was a real red letter day for you.
B：那天对你来说可真是个大喜的日子。
A：Yeah. We rolled out the red carpet to welcome him home.
A：的确如此，我们简直把他当贵宾一样来欢迎。