There are two parties in a divorce. The person filing is the "Petitioner," and the other person is the "Respondent."
If a prove up is scheduled, most judges require the Petitioner to attend the prove up because it is the Petitioner that is moving the case forward.
The Respondent is always welcome to come to the prove up. But technically speaking, absent an order from a judge, the Respondent need not appear if the Respondent has signed all settlement agreements with a notarized signature. However, there is a slim chance that the judge will require the Respondent to appear - but that usually in rare cases where there is something very unique about the parties' settlement agreement. That being said, to play it safe, the Respondent can simply show up - just to be on the safe side.
All that being said, the Respondent shows up to only around 25% of the uncontested divorces I handle, and most of the time they aren't even necessary.
On important thing to know is that if the Respondent didn't get settlement agreement signatures notarized, then he or she MUST appear in court. That way the judge knows - absent a notarization - that the Respondent actually signed the settlement agreements.