正誕 [－诞]

Jyutping zing3 daan3
Pinyin zhèng dàn

Definitions (粵典–words.hk)
  1. 名詞
    慶祝團體​所決​定​嘅​神明​誕​辰​嘅​正​日​，​亦​係​慶祝​活動​最​隆重​嗰​日
    the exact date of a deity's birthday, on which the grandest celebration activities take place