For all full semester classes, the Last Day to Add/Drop without Tuition Liability has been further extended to February 1st.
In addition, the Last Day to Drop with 33% penalty has been extended to February 9th.
The final drop deadline date has not been changed. February 19th is the last day to drop full semester classes.
For classes that meet less than the full semester, see http://registrar.gmu.edu/calendars/ for add deadlines.