You can control who can contact you throughout an event.
Follow the below steps to adjust who can invite you to video calls, direct message you, and invite you to meetings.
Join the event you are attending and click on your avatar in the top right hand corner of the screen. From the drop down that appears, click Edit profile.
Here you can set your personal info including your "about you" section, organization info and interests, if the Organizer has enabled them.
Click Privacy settings to decide who can contact you.
Next, highlight who you would like to be able to contact you for each specific contingency.
You can choose from "Organizers only" and "Everyone". Once you are happy with your selection, click Save.