If you're going to attend one of the 2008 Olympic event venue (in Beijing, assuming this also applies to venues in Hong Kong and Qingdao), be sure you are familiar with all the regulations that Beijing Olympic Committee has issued to the public.
You can see these regulations below:
Restricted articles include hard-packed drink and food; fragile articles; musical instruments; carry-on bags, suitcases and handbags which are too big to carry to the seats; flags of countries and regions not participating either in the Beijing Olympic Games or Paralympic Games and other flags over two meters in length or over one meter in width; flag poles of over one meter in length; banners, leaflets, or posters; unauthorized professional videotaping equipments; knives, bats, long-handle umbrellas, long poles, sharp-ended stands for cameras and video cameras, and other objects that may cause harm and injury to people; animals (with the exception of guide dogs); vehicles (except for strollers and wheelchairs); unauthorized walky-talkies, loudspeakers, radios, laser devices or wireless devices that interfere with the electronic signals of the Olympic Games.
The rule deemed the following behavior as inappropriate: smoking at a non-smoking area; crossing over the guardrail; using umbrellas or standing up for a long period of time in the seating area, thus obstructing the field of vision of other spectators; and flash photography.
The rule banned weapons and equipment including guns, ammunition, crossbows, and daggers; fireworks, firecrackers and other flammable materials; corrosive chemicals and radioactive materials.