If you are traveling to an RTC event from outside the country it is held in you need to make sure you have made arrangements for your VISA (if required) well in advance. It would be shame to find out you can’t attend because you overlooked this subtlety!
Traveling to Australia from Abroad – Apply for Visa (probably need ETA)
Traveling to the USA from Abroad – Apply for Visa (Probably Form DS-160)
Traveling to Ireland from Abroad – Apply for Visa (may not be required)