velobeat.com is a Recumbent Trike forum for enthusiasts and beginners.
Recumbent trikes enable an unparalleled level of comfort to human powered pedaling power and are sometimes the only option to those with certain special needs. Some of the fastest human powered vehicle land-records are set by recumbent trikes or "velomobiles."
Recumbent Cycle-Con
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Not sure where 2020's event will be held but this seems to be the defacto convention for recumbent bicycle enthusiasts. Looks like all the top manufacturers are there as well as prominent figures in recumbent cycling.
I found some YouTube videos that cover the conventions. They look like they're pretty well produced and not biased.
2019 Laidback Bike Report
2019 Laidback Bike Report Live Stream
2018 Laidback Bike Report
2017 Laidback Bike Report
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If I'm remembering correctly, 2020's Recumbent Cycle-Con will be in Indianapolis.
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I'm wrong, it will be in Dayton, OH this year: https://www.recumbentcyclecon.com/