I'm planing on traveling to Shanghai and Beijing (and maybe some cities in between) just before Chinese New Year. I've read online that it can be very hard to move around and book hotels around this time, but accurate information on what "this time" is seems hard to find.
Is it realistically possible to travel on the east coast of China during New Year? One week before? 2 weeks before? How about after new year?
Basically: when does the busy time start and when does it end?