Hello @Frank,
Thanks for the question! Although we don’t have an “official” registration form similar to an event app, what you can do is require name, e-mail for your participants in the beginning. This requires your participants to share their name/email upon joining Slido. Then if you’re using a paid plan, you can export that data afterwards.
With this setup, though, participants can submit fake e-mails or names. For receiving exact e-mails you would have to turn on restriction on what e-mails can access the slido. This is where you restrict your slido access to specific email addresses or domains.
I hope this helps! Let us know if you have more questions.