The red shirts will organise a motorcade rally from Bangkok to Chiang Mai along with other activities to mark the fourth anniversary of the September 19 military coup that ousted Thaksin Shinawatra.
Other events include a gathering at the Rajprasong intersection in Bangkok to commemorate both the fourth anniversary of the coup and the fourth month since the May 19 military crackdown on the red-shirt protesters.
The motorcade rally will leave Bangkok on September 18 from Imperial World Lat Phrao, and is scheduled to arrive in Chiang Mai the following day. About 50 vehicles are expected to take part. In Bangkok, red shirts led by Sombat Boon-ngam-anong, leader of the Red Sunday group, will tie dozens of red cloth pieces at the Rajprasong intersection.
Meanwhile in London, a group of red shirts led by exiled activist Ji Ungpakorn is expected to hold a rally on the same day.