festivity
词根词缀：
festal adj. 节日的
fest 节日 + al …的 → 节日的
festival n. 节日
fest 节日 + ival → 节日
festive adj. 节日的
fest 节日 + ive 有…性质的 → 节日的
festivity n. 喜庆
fest 节日 + ivity …力，…性；情况，状态 → 喜庆
fester v. （指伤口）溃烂
fest 仇恨 + er 反复动作，连续动作；拟声动作 → 和伤口有仇 → 溃烂
infest v. 大批出没；扰乱
in 使… + fest 仇恨 → 结仇 →〔因结仇而〕大批出没扰乱秩序 → 大批出没；扰乱
manifest adj. 显然的
mani 手 + fest 仇恨 → 仇恨得用手打 →〔恨意〕显然的
数据来源：新东方英语词汇速记大全
相关例句：
You may plan to go to a special festivity, or you may even be on vacation with someone you love.
你可以计划去一个特别的庆典，或者你可以和你喜欢的人一起度假。
On that day, all the families will eat noodles or fried glutinous rice blocks, and pop corn as part of the festivity. In the Greek candy-store was the whine of a peanut-roaster, and the oil smell of nuts.
这一天，家家户户还要吃面条、炸油糕、爆玉米花，以示吉庆。从那家希腊人开的糖果店里，传来了哔哩啪啦油炸花生的声音，散发着油炸花生的香味。
I thought it was intended for festivity.
我还以为只是为了图个喜庆呢。
The most famous eating and drinking festivity is the oktoberfest, which has been held in Germany annually in october.
最有名的吃喝玩乐的节日当属德国每年10月举行的啤酒节了。
The royal wedding was an occasion of great festivity.
皇室婚礼是喜庆的盛事。
Lion dance not only add more festivity to the special day but also provides opportunities for foreigners to know about the Chinese culture.
这种表演不仅很好地烘托了节日气氛，也成为外国人了解中华文化的一个窗口。