A while ago I asked about topic ideas for a community knowledge sharing event. After some work, the last thing preventing the pilot event is a good sign up method. Details in body :)

I'm wondering how I could make a good, privacy respecting public sign up system for an event that protects both the person signing up and myself. I'm hoping for something user friendly, but ultimately my safety is important. I'm not sure what's out there or if I'll need to roll my own, but I'd love some community brainstorming here!

TL;DR: What are some ways I can have a privacy-respecting public sign up for an event I want to host that protects me and the people signing up?