TTASS2021 has come to an end and we would like to thank you for joining us in this quite different edition of the summers school. We would like to thank our speakers who joined for their interesting presentations. We would like to thank everyone that helped make this online summer school a reality. Lastly, we would like to thank our sponsors for their generous support! Here you can download your digital goody bag with interesting materials from us and the sponsors. Hope to see you again next year!