Between where I stand and the mountain on the horizon is Gwanghwamun. The front gate to Gyeongbokgung has been under renovation since 2006, but the wait is over - and with it is the wait to appreciate Korea's foremost palace in its entirety.
The event also celebrated Liberation Day (also called V-J day if you're from the UK), or August 15th as it's known elsewhere. If you're from the US, you might be familiar with September 2nd as 'V-J day'; if you're studying holidays you don't get off of work or school, check out this Wikipedia article
for more information.