What should I include in a proof of performance report and how often should I send them?

Create race recap reports within 24 hours of each event including: a link to download photos and videos for the sponsor's use, race details and results, press coverage links, social media posts with screenshots showing engagement metrics (impressions, engagements, video views), and screenshots of positive comments mentioning the sponsor's products. Compile these into monthly reports tailored to each sponsor, then quarterly and year-end comprehensive reports. Include audience demographics and survey data annually. The year-end report helps your marketing contact justify the sponsorship renewal to their CEO or CFO.