July 23, 1973, Chicago Today magazine did a series about Pilsen, and one of the days they interviewed Henry Villagomez about the death of his friend Boogie. They had called a truce between several competing street organizations, and during the truce, they organized a concert, and El Chicano played at the Nuevo Leon on 26th and Trumbull. The series is worth reading, and you can read it here.
*Thanks to the Chicago person who had the website "cockroach people" where I found this xeroxed article 10 years ago.