If as a visitor to the show you need a letter of invitation to process your visa, you can request it from the registration website once you have obtained your pass.

Access Registered Users - Login:
Log in with your username and password, and access the Visa section:

Enter the data requested in the form and press the Submit button. Remember to make sure beforehand that the name, surname and company data in the User Data section are correct, as they will be included in the invitation letter.

Once the form has been sent, you can download the letter in PDF format from the website itself. You will also receive it by email.