Is fasting permitted on Lag BaOmer and other semi-holidays?

Fasts & MourningSemi-Holiday Restrictions

Synopsis

Fasting on Lag BaOmer, Rosh Chodesh Sivan until Shavuot, and the three days of Hol HaMoed is permitted, since the custom to avoid fasting is only a custom (minhag), not law (din). However, fasting during Erev Chag, Tisha B'Av, and Tu B'Shevat is not permitted.

Late Acharonim
Lenient
Strict
Lesser cited
Major authority

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