אורח חיים תקל״אOrach Chayim 531

Se’if 4ד׳

וְאֵלּוּ מְגַלְּחִין בַּמּוֹעֵד; מִי שֶׁיָּצָא מִבֵּית הַשִּׁבְיָה וְלֹא הָיָה לוֹ פְּנַאי לְגַלֵּחַ קֹדֶם הַמּוֹעֵד, וּמִי שֶׁיָּצָא מִבֵּית הָאֲסוּרִים וַאֲפִלּוּ הָיָה חָבוּשׁ בְּיַד יִשְׂרָאֵל שֶׁהָיוּ מַנִּיחִין לוֹ לְגַלֵּחַ, וְכֵן הַמְּנֻדֶּה שֶׁהִתִּירוּ לוֹ בָּרֶגֶל, וְכֵן מִי שֶׁנָּדַר שֶׁלֹּא לְגַלֵּחַ וְנִשְׁאַל עַל נִדְרוֹ בָּרֶגֶל, וְכֵן הַבָּא מִמְּדִינַת הַיָּם בְּחֹל הַמּוֹעֵד, אוֹ שֶׁבָּא בְּעֶרֶב הָרֶגֶל וְלֹא הָיָה שְׁהוּת בַּיּוֹם לְגַלֵּחַ, וְהוּא שֶׁלֹּא יָצָא מֵאֶרֶץ יִשְׂרָאֵל לְחוּצָה לָאָרֶץ לְטַיֵּל.

4. The following people may shave during the holiday: he who left captivity and did not have an opportunity to shave before the holiday; he who left jail, even if he was imprisoned by Jews who would have allowed him to shave; he who was banned [formally by the community] and allowed [back into the community] during the holiday; he who vowed not to shave and asked for the nullification of his vow during the holiday; he who arrived from abroad during hol hamoed or who arrived on the day before the holiday but didn't have time that day to shave, assuming that he did not go from Israel to outside of Israel for recreational purposes.

Se’if 5ה׳

אַף עַל פִּי שֶׁהִתִּירוּ לְהִסְתַּפֵּר, לֹא יִסְתַּפֵּר בִּרְשׁוּת הָרַבִּים אֶלָּא בְּצִנְעָה.

5. Even in instances where it is permitted to get a haircut, one should not get a haircut in the public domain. Rather, one should do this in private.