For the Notes 7 instructions, see: http://www.alanlepofsky.net/alepofsky/alanblog.nsf/dx/displaying-multiple-time-zones
Displaying 2 time zones in calendar?
It's a N8.0.1 capability. Upgrade to see this Calendar preference.
In fact I was not aware of this option. But I believe that you can do the same in Notes 8. "Click on the File-Preferences... - Calendar and To DO - Regional settings." And selecet "Display addtional...."
I'm running 8.01, maybee is this option only available in Notes 8.01 ??