Do I have to complete my profile?

Completing your profile page with as much information as possible will enable you to network and promote yourself more effectively.
Your preferences or areas of business interest for the event will enable potential business partners to find you easily, select you from the list and propose a meeting.
Likewise, if everyone does the same, you’ll be able to find the best potential clients or business partners.
If you choose to not to complete your contact details no-one will tell you off… just bear in mind that this may hinder the ability for your confirmed meeting request to be able to contact you, say, should they need to change the meeting point at the last minute.