Evoking a hindu ritual, subodh gupta did what outside the church that housed his very hungry god? washed peoples' feet meditated begged for money served soup sang and danced

The thing that Subodh Gupta did outside the church that housed his very hungry god is: Served soup

He served it as a form of 'prasad'. In Hindu ritual, prasad refer to offering material substance in the form of food to the Gods that they believed in.