Taking off of hot air balloons at the same time, 2015 <a href="https://en.wikipedia.org/wiki/Saga_International_Balloon_Fiesta" class="extiw" title="en:Saga International Balloon Fiesta">Saga International Balloon Fiesta</a>
<a href="//commons.wikimedia.org/wiki/User:Pekachu" title="User:Pekachu">Pekachu</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>