These are past events, but the specific information is proprietary to those events.   Please use the attached for sample purposes only.   

But, the essence is:

1. the cover page provides a graphic brand image
2. page 2 can provide event background
3. page 3+  sponsorship summary should explain marketing ROI and estimate a menu of marketing items at a higher appraised value than the actual sponsorship dollars invested -  hence the term ROI

Recommend this type of format for an initial electronic brochure,  just to get a website branded and have a piece to discuss with sponsorship prospects.   You can add to, augment, and refine content from there.