Here’s the route of Sunday’s Pedal on Parliament route from Glasgow Green to George Square and there’s an excellent video of the route being cycled on this page: http://pedalonparliament.org/pop-glasgow/
The route will be traffic-free, apart from lots of bikes! There are feeder rides in for the 1pm set off and other ways of getting to the Green are given on this page: http://pedalonparliament.org/getting-there-glasgow/
Do make sure you are there to demonstrate the need for good cycle infrastructure not just in Glasgow but across Scotand.