Find the Democratic party location in your Colorado neighborhood here.
Only people registered to vote as Democrats by now may attend.
If you are a Republican, you can still caucus, but you will have no input on your party's Presidential nominee because your party leaders thought that allowing that would attract too many people to the caucus which was too much trouble (really)! They were also concerned that somebody might accidentally vote for someone who dropped out of the race before the Republican National Convention at which a Presidential nominee is selected -- freeing those delegates to vote their conscience at the convention without being a party insider.
Republican caucus goers, however, do still have a say in who will have access to the ballot in the GOP U.S. Senate nomination race to some extent - and given the low level of publicity that race has attracted, the information voters can obtain at the caucus on this race in order to allow them to form an informed opinion, is worth the trouble.
If you are unaffiliated or you are not registered to vote yet (it's not to late to register to vote for the general election), you don't have a say in the partisan nomination process.
If you are registered to vote as a member of a political party that is not the Democratic Party and not the Republican Party, consult your political party's website for caucus, primary and nominating procedures (which vary).
Also, a few pet peeves. There is no such thing as the "Democrat party." Furthermore, you did not "graduate high school." And, this post was not "impactful" even if it had a major impact on your life.