齐聚一堂

齊聚一堂
qíjùyītáng
to get together all at once

CEDICT

to assemble together (of people)

Wiktionary

聚集在一起。

重編國語辭典

Entry Composition

1 齐聚 qíjù to gather together (at a place)
2 一 yī
  1. one
  2. single
  3. a (article)
  4. as soon as
  5. entire; whole; all; throughout
  6. "one" radical in Chinese characters (Kangxi radical 1)
  7. also pr. yāo for greater clarity when spelling out numbers digit by digit
3 堂 táng
  1. (main) hall
  2. large room for a specific purpose
  3. relationship between cousins etc on the paternal side of a family
  4. of the same clan
  5. classifier for classes, lectures etc
  6. classifier for sets of furniture

classifier: 間