For US fans that are attending Masters Shanghai.
These are things that you should know and follow.
If you decide to travel to Mainland China:
Enter the PRC on your U.S. passport with a valid PRC visa and keep it with you.
Read the travel information page for Mainland China.
Enroll in the Smart Traveler Enrollment Program (STEP) to receive alerts and make it easier to locate you in an emergency.
Avoid demonstrations.
Exercise caution in the vicinity of large gatherings or protests.
Avoid taking photographs of protesters or police without permission.
Keep a low profile.
If you are arrested or detained, ask police or prison officials to notify U.S. Embassy Beijing or the nearest U.S. Consulate General immediately.
Review the China Country Security Report from the Overseas Security Advisory Council.
Do not consume drugs in the PRC or prior to arriving in the PRC.
Follow the Department of State on Facebook and Twitter. Follow U.S. Embassy Beijing on Twitter, WeChat, and Weibo.
Visit the Centers for Disease Control and Prevention (CDC) page for the latest Travel Health Information related to the PRC.
Prepare a contingency plan for emergency situations.
Review the Traveler’s Checklist.
Source: https://travel.state.gov/content/travel/en/traveladvisories/traveladvisories/china-travel-advisory.html