noun
date (of an event, meeting, etc.)
Refers specifically to the scheduled date of a planned event, meeting, conference, or similar gathering.
次回の会議の開催日は来週の金曜日です。
The date of the next meeting is next Friday.
イベントの開催日が変更になりました。
The event date has been changed.
日時 includes both date and time, whereas 開催日 focuses only on the date.
Compound of 開催 (holding an event) and 日 (day).