A: A DV immigrant visa interview for FY 2020 must be rescheduled before September 30, 2020, and a visa has to be issued before September 30th, or the chance to immigrate through a Green Card lottery for this FY will be lost.
The embassies and consulates are currently closed because of COVID-19. If the case is pending at the U.S. embassy or Consulate, when they reopen, contact the consulate directly and without delay. They should be rescheduling everyone when they reopen. If the case is still at the NVC stage, you can contact NVC directly even now. NVC is currently open.
If you applied for adjustment of status and the case is pending at the local USCIS office, USCIS will begin rescheduling soon. USCIS had previously announced that they plan to reopen local offices on or after June 4, 2020. This date might change.