By Elizabeth Kramer "I wish you would just try to see that the world is shifting again." In the musical docudrama, "Party People" at Actors Theatre of Louisville, this appeal comes from Helita to her niece. In her youth, Helita was active in the Young Lords, a group founded in 1969 that launched campaigns for community organizing and self-determination for Puerto Rico, Latinos, and populations in colonized areas. She…