Is it permitted for a man to tweeze his eyebrows on chol hamoed and sefirah?And are there any sources for this?
Thank you very much,
Please see the following post https://dinonline.org/2021/04/05/tweezing-eyebrows-during-sefirah/?swcfpc=1 which talks about your question. Regarding Chol Hamoed, it is permitted for a woman to tweeze her eyebrows.
Chol Hamoed Khilchoso 3-5 ftnt. 13, that tweezing eyebrows is not included in the prohibition not to take a haircut on Chol Hamoed and if it is needed it is permitted.