I’m pretty annoyed but I don’t know if I have the right to be…it’s about my staff party?

Okay so I’m a photographer of a pub / nightclub and the owner asked me today sorry I hate to ask but would you take photos of us throughout the day of our staff party I don’t know I kinda annoyed about it like I can still eat and drink and stuff but I’m kinda working like
I’m pretty annoyed but I don’t know if I have the right to be…it’s about my staff party?
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