What is a Political Convention and How Does it Work?

The American political convention used to be an event where the Presidential pick was decided but things changed

CLEVELAND — Thousands of Republicans are gathering in Cleveland for the Republican National Convention 2016, followed by even more thousands of Democrats in Philadelphia next week, as both political parties hold their conventions to nominate candidates for president. Every four years, people tuning can see the speeches, watch the balloons fall on presidential candidates and wonder…