can someone please give me suggestions on how to do the following scenario?

We are using Exchange 2007 cluster w/ Outlook 2007 clients

1. Shared training group calender so whole team can see meetings and updates.
2. Must allow duplicate meetings at same time (different trainers, different
resources, same time)
3. Track changes ( all team members must be able to see who has accepted and
who has rejected the meetings and any other details that have changed.)

Right now the shared public calendar does not track changes because it gives
error that it is not part of the user's main calendar.

I tried creating  a separate user but it would not allow me to create
conflicting meetings.

Any ideas will be greatly apapreciated...