Immigration Closure 15-18th July 2011.All governments offices will be closed on July 15th and probably also on July 18th.
*Government schools are also closed on the 18th and the rest of government probably also.
Please keep this in mind if you need to do an extension of stay or have to go to a Thai embassy or consulate abroad on the 15th.
Embassies and Consulates are open on the 18th, honorary consulates might be open on the 15th as well.
Immigration policy is to allow to extend on the first working day if your permission to stay ends on a day immigration is closed, without a fine for overstay but remember that doing an extension early will not mean that you will lose any days.
The extension starts when your current permission to stay ends.
Good luck with you visa application.