Hey Yossi,
If by “users” you mean the general public visitor to your website, and specifically people who are not administrators or even registered users on your site, then unfortunately the Community Events add-on is required to allow users to add and submit events of their own → https://theeventscalendar.com/shop/wordpress-community-events/
However, if you mean that you have registered users on your site with non-administrator capabilities, and you’d like to enable them to just have the ability to create events in the admin, there are indeed several options for enabling this. If this is the sort of thing you’re aiming to do, elaborate on the details of what you need and we’ll point you in the right direction 🙂
Thanks!
George