here is some pertinent advice if travelling to Thailand in the mid to late October 2017
Please be respectful as this is a very important part of the Thai traditions. There is some good information on what you can expect, and how you can be kind and considerate in what you wear during this period.
"Out of respect for the Thai people and the late King, please do try to wear a black top or a white top with a black ribbon on October 13 and October 26. But if you can wear a black ribbon throughout the period from October 13-27 that would be a lovely gesture and one that will be appreciated by the Thai people you meet."
Most tourists attractions will be open as usual in Thailand throughout October. The notable exception is the Grand Palace and Temple of the Emerald Buddha which will be closed to tourists from October 1-29. On October 26 some other venues in Bangkok and around Thailand may close for the day or close early to allow workers to watch the funeral on television. On all other dates, tourist attractions around the country should be open as usual."