Show HN: Spin-a-thon fundraising platform, proof of concept

So I've been building this site: https://www.ride4ryan.com with a friend, whose brother-in-law was recently diagnosed with ALS. She's throwing a spin-a-thon fundraiser at her local gym, and wanted a place where people could register for different spin-times online, as well as donate via credit card. Beside good karma, donators should receive different supporting products - t-shirts, wristbands etc. (if they're over a certain amount - kickstarter style). So another HN user and I decided it'd be a great site to build for free - and if it worked well for her, something we could offer for others as well. The site automatically creates orders for her to manage when people donate over XYZ. She can manage the products - images, description etc. And the coolest part is the dynamic spin times (all she has to do is set a few variables and the rest of it is automated). Obviously payments are done via Stripe - directly into her bank account. Anyway, we'd love any comments / feedback about the usability of the site and or the design, and overall concept (as a platform we could offer for people to throw spin-a-thons). And of course - feel free to load up on some good karma if you feel the desire - we know it would be much appreciated :)