The academic calendar is published on the Registrar's webpage here: https://registrar.unl.edu/academic-calendar.
The calendar lists important dates for the semester such as:
Priority Registration-when enrollment for the following semester begins
Drop/Add Deadlines-when the last day to drop or add a course each semester is
Withdraw deadline-last day to withdraw from courses
Pass/No Pass Deadlines
It's a good habit to check the academic calendar before each semester and note the important dates in your calendar. You will be better equipped to make decisions about your courses if you are aware of semester deadlines. If you have questions about specific dates in the calendar, please reach out to advising.
More details at: https://registrar.unl.edu/academic-calendar/