We were lucky enough to bumble on a Full Moon night in Hoi An. They don't take place literally on the Full Moon (like we thought) but the 14th day of the lunar month (I think I'm remembering that right).
My gardening companion was a bit under the weather, so I ventured forth.
It was quite wonderful, with paper lanterns (similar to Mexican and Southwestern US luminaries) launched to float on the water.
Locals and tourists alike were there -- and there were many local folks enjoying the rituals. Quite nice.