How to enter the Olympics?

Most Olympic Trials are not announced by their individual country sport governing bodies until 1-2 years before the next Olympics are held. Also, they are not just open competitions that anybody can show up and participate in. They are mostly invitationals where the best in each country have already qualified through other means (regional or international competition results). In other words, if you build up those results, maybe you'll have a chance to make a future Olympic team.