bangkok people thailand celebrate loy krathong float basket festival friday follow year mourn late king bhumibol adulyadej saw many celebrations mute cancel mourn end monday five-day funeral last week many citizens return wear color garment stick black year participants festival pay respect water spirit float small traditionally-hand craft raft carry flower bamboo candle waterways ancient ritual raft also think carry away bad luck usher good fortune festival celebrate thailand particularly spectacular north festivities stay low key year respect late monarch however authorities capital say excessive celebrations focus showcasing thai culture chalermpon chotinuchit bangkok metropolitan administration bma tell reuters bma urge celebrants use raft make natural materials year environment group flag concern non-biodegradable components clog rivers drain festival participants also strike somber note sad period loy krathong everyone love late king rama ix say 23-year-old nanthicha sorndee safety concern prompt national carrier thai airways international cancel roundtrip flight bangkok chiang mai friday saturday say statement without elaborate northern thai city celebrate loy krathong alongside yi peng festival brightly light lanterns waft sky year mourn thailand 's 'floating basket festival return