Hi Daniella,
Thanks for the interest in our plugins. The easiest method to get someone to register for an event maybe to use one of our Ticketing Plugins.
WooCommerce is our best seller followed by Easy Digital Downloads, however they all have similar features so I would base your decision to buy on what eCommerce you like the best.
Using one of the ticking plugins you could use that as a way for people to register for an event.
I would recommend looking over our New User Primer for WooCommerce as it shows all the features of the plugin and how to setup and what info you can get from people to see if it will work with what you are looking for.
https://theeventscalendar.com/support/documentation/wootickets-new-user-primer/
Let me know if you have any follow up questions.
Thanks