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Version	Keynote/Event Date	Release Date	Gap	Event Context
Houdini 22	June 17, 2026	July 15, 2026	28 days	London (Curzon Soho Cinema)
Houdini 21	August 12, 2025	August 26, 2025	14 days	SIGGRAPH 2025 (Vancouver)
Houdini 20.5	June 18, 2024	July 15, 2024	27 days	Paris (HIVE)
Houdini 20	October 25, 2023	November 14, 2023	20 days	London (Curzon Cinema)
Houdini 19.5	June 15, 2022	July 13, 2022	28 days	Online (HIVE)
Houdini 19	October 18, 2021	October 27, 2021	9 days	VIEW Conference (Online)
Houdini 18.5	October 14, 2020	October 20, 2020	6 days	Online Keynote
Houdini 18	November 6, 2019	November 27, 2019	21 days	Montreal (Science Centre)
Houdini 17.5	March 7, 2019	March 12, 2019	5 days	Launch Presentation
Houdini 17	October 2, 2018	October 10, 2018	8 days	Montreal (Launch Event)
Houdini 16.5	November 4, 2017	November 7, 2017	3 days	Launch Presentation
Houdini 16	February 6, 2017	February 21, 2017	15 days	London (Rich Mix Cinemas)
Average gap (including H22)			15.3 days

EDITED: Updated with today's release for future reference.

If could be possible to open .step files natively (and natively, not converter to polygons), I would never use again any CAD program, but houdini, as per today is the best DCC out there. Huge mistake that CAD stuff is not supported. And I am pretty sure much more people would do, as it is procedural which is pretty CAD-esque.
I don't understand you SideFX, it doesn't make any sense you still not have it implemented, you are losing business.

Fair enough, thanks!!