Serendipity. While most of us would be happy just reading about this term and then moving on, Madeleine Kay went on to create a Serendipity Day, which is celebrated on August 18th. Kay defines serendipity as “the willingness to live your life as though everything is a miracle….with the belief at any moment, something wonderful is about to happen.” The purpose of the day is to give people an opportunity to live serendipitously, to be open to the endless possibilities and embrace them.