I've played with lots of calendar generations, and googled a bit to see what a "Broadcast Calendar" is; all i found was a bunch of (what i think) are fake/.virus sites that want you to download probable malicious code based on instant fake/web page generation based on a keyword search.
If you can provide a link to whatever the rules are for a "Broadcast Calendar", it would be easy for us to help built it up.
Lowell