Registration deadlines are specific dates by which individuals must complete their registration for various activities, such as college courses, events, or voting. Missing these deadlines can result in the inability to participate, so it is important to be aware of them. These deadlines can vary depending on the organization or event. For example, universities often have different deadlines for new students compared to returning students. Additionally, some events may have early bird registration discounts, encouraging participants to register before a certain date to save money.