Big names in blockchain and cryptocurrency area for a conference

Hi All,

Blockchain Australia is planning to organize an event similar to BLOCK-CON (goblockcon.com) that was held in Los Angeles and was a very successful Fintech and Blockchain in which 1300+ Fintech managers, CEOs, investors and startups attended, Blockchain AU is currently organizing a big event to be held in Australia, Melbourne and Sydney for the very first time around March 2018.
We anticipate this will be the largest Fintech conference ever held in Australia.

We negotiated with a couple of people in this area such as Andreas Antonopoulos, Joseph Lubin , ....., we need help in these two areas below:

1-Help us identify big names of Cryptocurrency, Blockchain and Fintech
2-Help us get connection to these names, especially we've been trying to contact with Vitalik for the conference, haven't been successful yet, any help is appreciated

Kind Regards,

Blockcon