Hello. I would like to know which of the below prepositions is the correct one.
For example:
Our doctors are not seeing patients today since they are at / in congress.
Also, I think that another possibility is:
Our doctors are not seeing patients today since they have to attend congress.
Thanks in advance.
Our doctors are not seeing patients today since they are all in a meeting.
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Our doctors are not seeing patients today since they are all in a meeting.