Th major events of the summer are going to be secured out the wazoo, an attack there is what is expected. If I were a terrorist I would plan and execute attacks at malls, sporting events and schools. As they do in Israel. You want to really thro the average American into panic and choas? People can avoid big major events, only political leaders will be at the conventions. In a representative system you don't have to kill the leaders, just their constituents.
I worry a little, here in Indianapolis the home of the largest sporting event in the world 3 days from now.