Can I submit two papers to the same conference event as me the first author? I have two studies that are not related to each other but in the same domain (Social Media Analysis) and I already submitted one of them to a conference as my name the main author. 

-Can I submit the second paper where I am also the main author to the same conference event? I have read the conferance regulation but did not find any related information for such an issue.

EDIT: I also tried to contact them, but since two weeks, still no answer and the deadline is within 2 days. And normally if it ok to submit two papers, will I be having two-time slot for the presentation, or will it be one slot to manage both?
Yes, unless the conference regulation specifies a different policy, it's fully OK to submit multiple papers as main author to the same conference.