The Third Circuit has posted this announcement on its website:

Wednesday, December 5, 2018 – National Day of Mourning

The United States Court of Appeals for the Third Circuit will observe the National Day of Mourning on Wednesday, December 5, 2018. Limited Clerk’s Office staff will be available to address emergencies and accept filings. Filing deadlines that fall on Wednesday, December 5, 2018 will be automatically extended for Federal Government agencies. Non-federal government parties may continue to file through the Court’s CM/ECF system.

I believe no arguments had been scheduled. Note that deadlines are extended only “for Federal Government agencies.”