Dec 5 marks His Majesty's 85th birthday.
Tongthong Chandransu, permanent secretary of the Prime Minister's Office, said there will be an oath of allegiance to be taken by the Royal Guards on the same day.
Two rehearsals will be held on Nov 29 and Dec 2. Prime Minister Yingluck Shinawatra, the army commander in chief, the presidents of Thailand's courts and more than 2,000 military officers will join the Dec 2 rehearsal.
Mr Tongthong said gigantic LCD screens will be installed on both sides of Rajdamnern Avenue leading to the Royal Plaza and Ananta Samakhom Throne Hall to enable the crowd to clearly see HM the King and royal family members.