Making sure end_date is not set to current timestamp by default
Making sure end_date is not set to current timestamp by default

dssg/plenario,UrbanCCD-UChicago/plenario,UrbanCCD-UChicago/sf-plenario-backend,dssg/plenario,tosseto/plenario,tosseto/plenario,UrbanCCD-UChicago/sf-plenario-backend,UrbanCCD-UChicago/plenario,tosseto/plenario,dssg/plenario,UrbanCCD-UChicago/sf-plenario-backend,UrbanCCD-UChicago/plenario