Question:
Is it ok for me to organize a tehillim group on Chol Hamoed for someone who is sick but not seriously sick?
Answer:
It is permitted to daven and say tehillim for a sick person or for anyone on Chol Hamoed. Davening does not invlove melacha or something that is disrespectful to the moed. Therefore it is not an issue at all.
Have a good year