Just a hunch, but I would anticipate widespread difficulties with wireless communication devices during the convention. Can it be done? I certainly hope so, given the recent cell phone triggered election manipulation in Madrid.
Will it be done? I don't know, but I do hope that there are operational plans and resources prepared in the event that it is required. Activist swarms would certainly provide good cover for terrorist activities.
In any event, if there are RF communications outages, they will probably be blamed on a pesky squirrel having fried itself in a critical substation.
Certainly leaves the question hanging, will they try to trash the election as well? If they can throw the election results into question by jamming (even just to lose votes) the different types of electronic ballot boxes, the anarchists' job will be done.