Here is the very useful Achieving Synergy Guide to Planning a Successful Corporate Training Workshop. Keep a copy yourself and share it with your colleagues. Topics include,

1. Plan for purpose
2. Identify resources required
3. Take a closer look at the current situation
4. Develop workshop aims, objectives, desired outcomes, outputs and deliverables
5. Appropriate themes, locations and specific activities before, during and after the workshop
6. Communicate with the team and set agenda