This phrase refers to the involvement in communal or organizational activities within the Chabad movement. "כרם חב"ד" (the Chabad vineyard) metaphorically represents the broad range of Chabad's outreach and educational efforts. "עסקנות" refers to the work, leadership, or activism undertaken to support and advance these initiatives.
Community work in the Chabad context often includes organizing events, educational programs, outreach efforts, and other activities aimed at spreading Torah, mitzvot, and the teachings of Chassidus. Those involved in this work, often called "askanim," play a crucial role in ensuring the success and growth of Chabad's mission to reach and inspire Jews around the world.