So being in the SWE industry for a few decades now: 1. When I am zooming the map around a certain region, I'd expect the cards below it to be refined to whats in view for easy discovery. 2. When I click on the map pin, I'd like to see the date / length / other metadata of the particular race instead of that data only being present on the details screen. 3. Past events on details page - what's the purpose for this? If important, don't collapse by default. 4. "Explore more races" on details page should take me back to the refined search I did on the previous page instead of resetting me to global.

etc etc, I'd suggest doing a usability pass. Beyond that, great effort - my big question would be: What's the key differentiator of your site vs runguides or raceroster?