Those people you see throughout Downtown, and in LoDo, selling papers are worth a visit. For only a dollar, most of which goes to the vendor, one can obtain a well-designed and well-written paper examining issues of homelessness and urban life.
You may have heard of the Living City Block initiative. You may have not. Buildings on both sides of Wazee, 15th to 16th comprise the pilot effort. Read about it here, at the Denver Voice site, in a very objective article written by Kristin Pazulski.
And, help as you can. The project if you like. And, especially the homeless vendors.