You can check the deadlines in the Home page & Registration Page.Deadline Page link

Download the Scientific Agenda from scientific information, you can view the program of the conference.Scientific Agenda link

Yes, an official invitation letter in the conference letterhead will be issued once your registration process is successfully completed.

Participants are requested to take care of the visa process on their own.

Yes, on paying the accompanying person fee, they can join the conference.

No, the certificate won't be provided to the accompanying person unless he is a co-author.