A visa is required to enter the United States for many nationalities. Please check with your local U.S. embassy/consulate whether this applies to you. In case a visa is required, please apply as soon as possible, as obtaining the visa may take several weeks.
The United States Department of State provides a list of countries that are participants in the Visa Waiver Program.
If you need an invitation letter to CC 2017, you should register for the conference first. Please note, we reserve the right to wait until the registration charges have cleared through the registration and credit card system before issuing the letter.