Labor Union Act Article 23

The general meeting of members or member representatives of a labor union is classified into two types: the regular meeting and the extraordinary meeting. Both of them shall be convened by the chairperson of board of directors.The regular meeting shall be convened at least once each year and the notice of such a meeting shall be received by members or member representatives no later than fifteen days prior to the scheduled meeting date.The extraordinary meeting shall be convened by the chairperson of board of directors of a labor union by the resolution of the board of directors, or upon request of over one-fifth of total members or over one-third of total member representatives, or upon request of the board of supervisors. The notice of such a meeting shall be received by members or member representatives no less than three days prior to the scheduled meeting date. Provided that, in case an extraordinary meeting is convened due to an emergency reason, the notice of such a meeting may be received by members or member representatives no later than one day prior to the scheduled meeting date.
中文原文 工會法第23條
工會會員大會或會員代表大會,分定期會議及臨時會議二種,由理事長召集之。
定期會議,每年至少召開一次,至遲應於會議召開當日之十五日前,將會議通知送達會員或會員代表。
臨時會議,經理事會決議,或會員五分之一或會員代表三分之一以上請求,或監事之請求,由理事長召集之,至遲應於會議召開當日之三日前,將會議通知送達會員或會員代表。
但因緊急事故召集臨時會議,得於會議召開當日之一日前送達。

English translation for reference only; the Chinese text prevails. Not legal advice.