Is there a plug-in or API that handles multiple event rsvp for a wedding website

I am building a wedding website for my friends on top of WordPress. They want to detail out their multi-day wedding by dedicating a page for each event and allowing people to RSVP to each. I want to make it really friendly for users to go through, so they don’t get confused by multiple events and also don’t have to RSVP dozens of times.

I’m wondering if there is a plug-in or an open source software or even a paid service that I can latch onto to support this site. I’m not an expert programmer, so I’d just love something that already has this functionality that I can just skin and tweak. Doesn’t even have to be a WordPress plug-in.

Help!!