San Juan's major events, ranked by crowd impact
Every event here is verified by a person, dated from its own organiser, and measured against San Juan's day-by-day crowd forecast — so they can be ranked on one scale. See the city, day by day →
#1 Fiestas de la Calle San Sebastian (SanSe) →
Fiestas de la Calle San Sebastian is the busiest of San Juan's 1 verified major events — its busiest day reads Packed, busier than 96% of San Juan's year.
The 2027 Fiestas de la Calle San Sebastian in San Juan runs 21–24 Jan 2027, confirmed; expect Packed days — busier than 96% of San Juan's year. (Avoid-Crowds, as of 2026-08-29; recomputed nightly.)
Disclaimer — event dates can change; expected dates are labelled and can move.