How to let user register for an event without login?

Dear colleagues. I would like to raise the topic - How to let user register for an event without login?
Perhaps someone had a successful case in implementing the event registration algorithm without Joomla authorization? With the addition of required fields to fill in: Name, E-mail, phone

I don't understand your problem: In my case my joomla site registration only needs: Name, E-mail, (if wanted phone).
But if you want you can:
a) create a contactform with additional fields
b) use e.g. breezingforms (you find infos in forum)
With joomla site registration you can verify a valid email, so you have valid eventregistrations.
Without that event registrations can be abuses, and you will have many problems.

Hi,To allow users to register for an event without requiring login, you can implement a simple registration form that collects basic details like name, email, and phone number. Ensure form validation is in place to prevent spam and errors. Use CAPTCHA for added security. Once submitted, the data can be stored in your database or sent to an admin email. This approach enhances accessibility and user convenience, especially for one-time events or non-technical audiences unfamiliar with account creation.

You're right, this is possible, but like that it is possible to get wrong registrations: emails and phones are phantasies. Then you have damage.
With a simple joomla registration, at least the email address is verified and the event registration is counted.
Jojo

Allowing users to register for an event without logging in simplifies the registration process and boosts participation. This can be implemented by using a public registration form that collects essential information like name, email, and contact details Add CAPTCHA or email verification to prevent spam or fake entries. Ensure the form is mobile-friendly and secure ( SSL encryption). Use a backend script to store the data and optionally send confirmation emails. Consider limiting duplicate registrations by checking email or phone number. While login offers more control, removing it improves accessibility and convenience, especially for casual or first-time users 

you're free to do that
Jojo