In order to share a Zoom link directly to a user or an invited guest is easy. Click Little Green Icon, the dialog box opens up, then Click Copy Link.

Now, if you copy this link and send it to someone, they can join you directly inside a Zoom without having to register or pay for any lives that you've set up. This is how you can send a direct link to someone when your Zoom session has started and it's very good for getting participants and speakers.

Consider setting up some sort of group where you can share this for speakers to attend a particular time slot on your Zoom session.