Go here for a large percentage of questions you may have..
This is the MSP Firearms page, which has ALL the facts and rules on Concealed carry.
MSP - Firearms
As far as the MCRGO, Places to avoid list, these are places of business or venues, ( County fairs) and the like.
MCRGO - Do Not Patronize while Armed
IF you are outed, by someone in management, and verbally requested to leave, and you do not, they can then call the local authorities, and have YOU cited for trespassing.
Long story short, if you want to carry at the mall, conceal carry, and if outed , leave.
The seating capacity rule is for venues,(arenas), such as concerts, plays ,sporting events which have either a posted seating capacity of 2,500 or more seats, OR a designated venue, (such as the silverdome 80,000,, Palace 20,000+ ETC,,,,,,) which is widely known to seat over the 2,500 rule.
So if you go to say a small outside concert, and there is no obvious sign, you basically have no way to acertain, how many seats it has there , you should be good.