Attendees can specify the date and time they are available to meet other People. With that, Attendees will only receive Meeting requests for the times they marked as available, making the networking experience more pleasant.
How to manage Meeting slots availability
In the Event App, go to My Event (from the top navigation bar, or through the Button located on the Event Homepage) and then open My Meetings where you will find the Manage availability option.
Once you click on Manage availability, you will see a list of all the available Meeting Slots (created by the Event Organizer). Those will all be pre-selected, and you simply need to de-select the slots that you want to make yourself unavailable.