a day of festivity的用法和样例：
- As was a day of festival the town was already beginning to jump.
- The governor decreed a day of mourning.
- I was worn out after a day of shopping.
- You're enjoying yourself now, but a day of reckoning will come.
- My legs felt weak after a day of running around.
- To sensible mem, every day is a day of seckoning.