That which it says in the gemorah that one has a chiyuv of "kabbalos pnei rabo" b'regel when is the chiyuv? Is there a chiyuv everyday or just once during the regel? If it's only once is it davka on Yom Tov itself or even on Chol HaMoed. Certainly if the chiyuv is only one day there would be a mitzvah every time he goes to see his Rebbe. However when is the actual "chiyuv" -- on yom tov, chol hamoed, or either one (or perhaps everyday.)
Yehoshua, Yerushalayim, Eretz Yisrael
Shalom Yehoshua,
Refer to Bi'ur Halachah, OC 301 Se'if 4 DH Lehakbil Penai Rabbo.
The Chafetz Chaim quotes the Ritva who says that it depends on how far one is from his Rebbi: If he lives in the same city as the Rebbi he has to go to him every day (!). If he lives close to the city then the Chiyuv is once a week or once a month. If he lives very far away then he must see his Rebbi once during Yom Tov.
Feel free to write back for further clarification.
Shevach Pepper