Re having access to arena & watch players participating, only if you have credentials and passes given by the IOC.. Re tickets, the only way is to get them from individuals (scalpers) or ticketing agencies. Was like that in 2008 as well. I know the IOC and NOC tried to get "rid" of all the tickets by selling them to those ticket reseller companies which was smart. Those ticket reseller companies in turn will have to resell it @ a higher price if they wanna get profit...but at the same time, the ticketing website companies are gambling that people are gonna go & watch the events & matches. Otherwise, if there are no buyers, the ticketing agencies will incure the costs & lose..