1)Everyone, except Jess and Susie, was present at the company meeting yesterday.
2)Everyone, except Jess and Susie, were present at the company meeting yesterday.
Which is correct?
1)Everyone, except Jess and Susie, was present at the company meeting yesterday.
2)Everyone, except Jess and Susie, were present at the company meeting yesterday.
Which is correct?
Your first example is the correct sentence. The subject of the verb 'to be' (conjugated as 'was' in the correct sentence) is the collective pronoun 'everyone', which, as a collection, is a singular entity.
The clause in parenthesis ('except Jess and Susie') does modify what constitutes that singular entity, but it is ancillary to the main clause. Even if the group ('everyone') is smaller in the absence of Jess and Susie, neither of whom are subjects to the verb in the main clause, the group itself remains a discrete, singular entity.
A group is still a group, even when it is missing some members.