From the web-site:
"Our favorite time of the year is in July when we get to gather with hundreds of passionate React Native developers in Portland for Chain React. Unfortunately, after a lot of discussion, the organizers have decided to cancel the conference for this year (2020) due to widespread concerns about COVID-19.
It is, of course, not a fun decision to make. We look forward to Chain React every year! This year we had some really exciting speakers lined up, new workshops, and some great sponsors. But in the end, it felt like the right call. We couldn’t ask our staff, speakers, workshop instructors, and attendees to make travel plans in this time of uncertainty.
We appreciate your interest in submitting a talk to Chain React and are hoping you’ll join us in 2021.
See you next year at Chain React 2021!"