At the press conference, Jean-Pierre said Biden spoke to six hundred people at each event on Sunday. According to these news outlets, far fewer people attended than she claimed.
"Mr. Biden told several hundred people at Mount Airy Church of God in Christ…"
https://www.nytimes.com/2024/07/07/us/politics/biden-pennsylvania.html
"attended a campaign event on South 43rd Street in Harrisburg with hundreds of supporters"
https://www.abc27.com/news/top-stories/president-biden-touches-down-in-harrisburg/