The Secret Service says these things are planned for years in advance. There will be no guns at the RNC in Cleveland at the Quicken Loans Arena. This was the case in 2012 in Florida as well.
Source
http://www.msn.com/en-us/news/politics/secret-service-says-no-to-guns-at-republican-convention/ar-BBr2zNm?ocid=spartandhp
http://abcnews.go.com/Politics/secret-service-guns-gop-convention-petition-open-carry/story?id=37981517
