Lindell, a close ally of former President Donald Trump, has repeatedly pushed disproven voter-fraud conspiracy theories about the presidential election, prompting the voting-machine company Dominion to sue him for $1.3 billion.
Some attendees at Monday's event brought along Trump merchandise, including hats and flags. Salon.com's Zachary Petrizzo reported that a group of far-right Proud Boy members attended, citing a source at the event.
The event featured talks from Ben Carson, Trump's secretary of housing and urban development, who joined on video call, and the conservative podcaster Eric Metaxas. The comedian Joe Piscopo of "Saturday Night Live" fame performed a music set, which included the national anthem.