From inside your account, mouse over the "My Account" link in the upper right corner of the screen and select "Profile".
This brings you to a management dashboard with multiple tabs at the top that you can select. Click on "Company info" tab to enter any and all information about your company that you want to share.
Event attendees will be able to view your profile from any of the events you created and will be able to contact you in the manner you specified. This is a great way to give your organization extra visibility.