Vipassana Meditation (Dhamma centers network)

This isn't a single event so much as a quiet global network - over 200 Dhamma centers on every continent teaching the same 10-day silent meditation course, as taught in the tradition of S.N. Goenka. No talking, no phones, no charge (courses run entirely on donations from past students), just ten days of sitting, walking, and learning to observe your own mind. It is genuinely hard and genuinely free, which is a rare combination.