In my opinion, there should be no problem with you publish multiple articles on the same date but technically it is impossible to do justice to all the content pieces when published on the same date. If I would be at your place, I prefer to go with the calendar. I would prefer to create the calendar based on the team members I have.
If I will have two to three members in my outreaching and content promotion team, I would prefer not to publish more than two articles per day.
Once the content piece will be launched I will ask my team members to start the promotion activities which include outreach to like-minded people, social bookmarking, link outreach and more.
This will also depends upon the website popularity, if you have a website like Search Engine Journal where people do expect more than 2 to 3 articles a day I will go ahead and follow the trend but if not then I will start a slow and move accordingly based on how much traffic I am receiving on each content piece.
The best idea is to see how popular you are within the community, what your readers are expecting and act accordingly.
Hope this helps!
