The Wellington Jazz Festival in 2025 is scheduled to take place from October 15th to October 19th. This festival features a diverse lineup of internationally acclaimed jazz artists and multiple venues in Wellington, New Zealand.

If the question is about other jazz festivals, here are some notable ones:

• The 30th Nelson Jazz Summer Festival was held January 3-5, 2025.

• The Port of Tauranga 62nd National Jazz Festival was held April 7-21, 2025.

• The Newport Jazz Festival is scheduled for August 1-3, 2025 in Rhode Island, USA.

• The Detroit Jazz Festival runs from August 29 to September 1, 2025.

• The Monterey Jazz Festival will be held September 26-28, 2025.

If the inquiry is about a specific "Jazz Fest 20," additional detail would be needed to identify the exact festival. However, the prominent 2025 Wellington Jazz Festival is October 15-19, 2025.

Please clarify if a different jazz festival or location is of interest.