Be in attendance
Definition 1 of 1
Pro Tip 1/3Event Expectation
Use it when an event expects people to be present as a form of participation or duty. 
The award ceremony starts at 7 PM, and all nominees should be in attendance.
Pro Tip 2/3Formal Settings
Often used in formal or official contexts to emphasize the importance of being present. 
Dignitaries and officials were in attendance at the inauguration.
Pro Tip 3/3Presence Importance
Implies that one’s presence at an event is noteworthy and may have significance. 
The company's CEO was in attendance, highlighting the meeting's importance.