What are the dates for 2017 dragon boat festival and how difficult will travel be during this time?

It is on May 30th this year. People will have a three-day holiday during May 28~30. It is suggested you visit China during that time and you will have a chance to enjoy this unique festival.
The train tickets and air tickets might be a little bit hard to come by. You need to book them at least two weeks ahead. Oh, also book the hotel in advance just in case.