Sure enough, my mate Google knew all about it:
Further reading told me:February 3 is annual celebration of Veterans' Day in Thailand. This day commemorates the foundation day of the War Veterans Organization of Thailand. The official remembrance ceremony takes place at Victory Monument in Bangkok. The monument was erected in 1941 to commemorate the victory of Thailand in Franco-Thai War.
This day was completely new to me, so I thought I'd share it. Apologies if most of you were aware already. I found it interesting that the red poopy is used to symbolize the same thing in Thailand. However, I've never noticed poppies on sale for this charity here.In the Thai National Anthem, one phrase of the lyrics says that the Thai people love peace but when there is a war we will fight audaciously. As you know war has never given anyone happiness besides sadness, tear, and loss. In fact, the Thai people have been forced to protect our independence and sovereignty for many times in our history. Thai soldiers sacrificed their lives and blood for saving our kingdom, so that Thai people can live our lives in this country happily. Thai people reminisce about their soldiers’ bravery on this special occasion. All Thai residents heartily show respect to honor the veterans’ sacrifices on Thai Veterans Day…
In Thailand the Veterans Day is the 3rd of February every year. To praise the bravery of veterans and to help the families of soldiers who died in fighting to protect national sovereignty. The red poppy is a symbol of the veterans; it is a symbol of the blood of the soldiers who had shed their blood on the kingdom with courage and supreme sacrifice. So, in that day we shall see the poppies blooming throughout the country.
The are preparations for the sale of poppies on Veterans Day aiming to raise funds to support the troops, veterans and their families.