Summerfest isn't really checking people for weapons. I heard about the issue about Saturday, June 29, where people did not feel safe. Not enough police and you can't protect yourself since this is a "special event."
http://fox6now.com/2013/07/01/police-chief-ed-flynn-responds-after-summerfest-overcrowding/
http://www.todaystmj4.com/news/local/213927081.html
And who needs to protect themselves outside of Summerfest?
http://fox6now.com/2013/06/27/street-performer-assaulted-outside-summerfest/
http://fox6now.com/2013/07/01/police-chief-ed-flynn-responds-after-summerfest-overcrowding/
http://www.todaystmj4.com/news/local/213927081.html
And who needs to protect themselves outside of Summerfest?
http://fox6now.com/2013/06/27/street-performer-assaulted-outside-summerfest/