1
Most regional festivals are free entry
Korean municipalities fund a huge number of free festivals (flowers, food, light shows) — free entry is the norm, not the exception, sometimes with paid stalls or activities on site.
2
Check the event's official site
The link sits on the event's VisitKorea page — it's the most reliable source for the program, hours, and any last-minute changes.
3
Book via a Korean platform if a reservation is required
When a festival has paid premium activities or an attached concert, booking usually goes through NOL or YES24 — see the matching guide on this page.
4
Call 1330 when in doubt
Korea's tourism hotline answers in English, Chinese and Japanese, 24/7 — handy for confirming a time or address when the official site is Korean-only.

💡 Good to know

When a price shows as "see details", the organiser simply hasn't published one in advance: in almost all of those cases entry is free and only some on-site activities are paid. Bring a little cash — many stalls don't take cards.