元宵节快乐英文是Happy Lantern Festival。
festival：n.(音乐、戏剧、电影等的)会演，节;节日;节期;喜庆日；
复数： festivals
（图片来自网络侵删）
I wish you all happy at the Lantern Festival!
祝大家在元宵节快快乐乐！
Six theatre companies have been selected to take part in this year's festival.
已选定六个剧团参加今年的戏剧节。
The film festival takes place in October.
电影节将于十月举行。
This year's festival attracted a record turnout.
今年的节日吸引的参加者之多创了纪录。
