As per Dr.Shahid Masood, Only One PTI member, besides Imran Khan & Tahir ul Qadri (He was alone) were aware of the meeting. Dr. Shahid knew about the meeting from (Qadri or Imran).
Today, SMQ categorically said that Shireen Mazari wasn't aware of it. Nor alvi, nor asad , nor tareen nor any one else.
Also, in the same program (its from july i guess) Dr.Shahid said that some how, the news is out about the meeting, and Javed Hashmi is furious over it (When he left for his first time) , that why Imran Khan never took him in confidence. As per SMQ , it was Qadri , who was against telling anyone about the meeting from PTI people.
SMQ & Shahid Masoods version is almost identical.