Much of the uptick according to Onondaga County Democratic Elections Commissioner Dustin Czarny, is a direct result of the coronavirus pandemic.
“Voter registration during the summer and spring was almost non-existent because of the coronavirus,” Czarny said. “The DMV’s were closed. They usually generate new voter registration changes, address changes, and they got pushed until after Labor Day when we starting seeing a tick up.”
Czarny said that voter registration also tends to go up during presidential election years.
https://www.wrvo.org/elections/2020-10-07/voter-registrations-surge-ahead-of-october-9-deadline
Dustin M. Czarny 