It's difficult to conduct 2 programs in same travel. We extend to create program in Chaingmai on AUG 4th, because on JUL 29th, is a long holiday in Thailand. We concern that customers could not to join the program. The professor in Chaingmai university who cooperative program with us prefers AUG 4th, they provide a place and invitation other customers. We agree with you and have enough time to invite customer.