1. Productbuild + ARD demo suggestion:

Create a distribution package of a small app (man productbuild) and distribute the package to each attendee’s Mac using ARD.

Example for Firefox :

productbuild --component /Applications/Firefox.app/ /Applications/ ~/Desktop/Firefox.pkg

2. pkgbuild

General example :

sudo pkgbuild --install-location /Applications --component /path/to/app/for/MyGreatApp.app ./path/to/save/package/packagename.pkg

Example for Firefox :

sudo pkgbuild --install-location /Applications --component /Applications/Firefox.app ~/Desktop/Firefox_v300.pkg

Reference articles :