Das, who is in Delhi now, invited Road Transport and Highways, Shipping Minister Nitin Gadkari, Law and Information Technology Minister Ravi Shankar Prasad, Union Minister of State for Coal (Independent) Piyush Goal, Minister of state for Petroleum (Independent) Dharmendra Pradhan and Minister of state for Commerce and Industry (Independent charge) Nirmala Sitharaman, an official release said here.