Thursday was the beginning of what I guess you call Buddhist lent. It's the 3 month (or so) time when all the monks kind of retreat into the temples for serious study and meditation time. It also happens to be the height of the rainy season, so their planning for 3 months indoors is not so bad. Anyway, Thursday morning is a day for everyone to go to the temple to give food, flowers, money, etc. for the monks. You can see everyone lined up here to give food and such.