Lag ba'Omer: What's Behind the Celebration? - May 5, 2026 - The celebration of Lag ba'Omer is as much of a mystery as the prevailing practices in the period that leads up to it. We examine the two popular explanations - the cessation of the death of R. Akiva's students and the "Yahrzeit" of R. Shim'on bar Yohai - and demonstrate that neither explanation is reasonable, period-documented or satisfactory. Looking into the earliest source where the date of 18 Iyyar appears, we discover a surprising (possible) explanation which puts Lag ba'Omer into a new light.