There are the two in-person certificate courses which will be offered by Linguistics Institute, Payap University in June-July 2025.
First Language-Based or Mother Tongue-Based Multilingual Education (L1-based MLE/MTB-MLE) Certificate Course: June 16-July 11, 2025
Materials Development Certificate Course: July 14-25, 2025
Training Venue: Linguistics Institute, Payap University, Chiang Mai, Thailand
You can choose to take one or better yet, both. They complement each other and are useful in the literacy or education programme you are involved in.