To celebrate the holiday students visit their current and former teachers, give presents (usually flowers), and - the best part of all - teachers get the day off to rest and relax. As a teacher I must say it makes you feel pretty special.
In case you're wondering what's being loaded in there, well that's a big pile of grease. Dirt, bricks, various dirty building materials are all common cyclo cargo.
To be fair, the cyclos in Hanoi are a bit nicer, but to me there's something a little too lazy about having some poor guy cart you around town. And, strangely enough, the only people I've ever seen in them are fat, lazy looking tourists.