Yes, you can easily upload your logo to your registration page.
Make sure you're creating a new event or editing and existing one
Scroll down to step 6
Click Choose logo
Upload a JPG, PNG or GIF file no larger than 100kb (square images look best)
If you’d like to remove your logo, just press Remove
You can set your logo to appear on all of your events in the account settings. Please refer to section on Customising your account for more information.