Even if testing isn’t required, what activities should I test myself before or after?

Testing before large events, overnight events, or before visiting vulnerable people is a safe and effective way to prevent the spread of COVID-19 during these activities. It may also be a good idea to test yourself after returning from a large or overnight event where you were in close contact with large numbers of people. This practice is especially helpful if you will resume normal activities, such as going to work, school, or visiting family, upon returning from the event so that you can be more sure that you will not infect others.