During my Southeast asia trip in november 2019 I finally went to the north of Thailand and visited Chiang Mai during the Loykrathong / Yee-Peng festival. I only stayed for 3 days but visited temples, a cave, the ‘sticky’ bua tong waterfall and learned to cook amazing thai food.
At night, we bought sky lanterns and let them rise to the skies which looked amazing due to the many lanterns.
Please keep in mind that these lanterns may not be allowed to use in your country or area, especially if you’re near an airport. They pose a dangerous fire-hazard if they get entangled in a tree or fall down early. Chiang Mai has a special allowance and lockdown on night-flights during the festivities and many police officers make sure nobody is hurt by burning parts falling down.