The Atacama Pathfinder Experiment (APEX) 12 m submillimeter telescope has significantly contributed to a wide variety of astronomy science areas since 2005.

Since 2012, every other year, the Ringberg APEX workshops bring together APEX users and other interested scientists working on a wide range of exciting results covering the Solar System to distance galaxies in the early universe. APEX2020 aimed at presenting new science results and to looking into new science opportunities for the next years. We presented the status of the CONCERTO experiment, and the science with CONCERTO.