JULY 27, 2020 — The U.S. Census Bureau announced that it will begin emailing households in low-responding areas to encourage them to respond to the 2020 Census...

The messages alert households in low-response areas that time is running out and their response to the 2020 Census is important for their communities. The email messages will invite people to respond online at 2020census.gov...

Households have until October 31 to respond to the 2020 Census. However, census takers have begun following up with households that haven’t responded yet in select areas and will begin following up with households nationwide in August.
https://www.census.gov/newsroom/press-releases/2020/2020-email.html