First of all, it makes sense to have it in Charlotte, Greensboro and the 336 are on the western half of the state and gravitate more towards Charlotte...
Greensboro is 77 miles from Raleigh, 92 miles from Charlotte. If it was 7 miles west it would be equidistant from both cities, so essentially its nearly the same distance to both. But 252, 910, 919 are considered the eastern half of North Carolina. 336, 828, 704 is the western half of NC...
Second of all, A&T is the most prominent HBCU here and one of the most esteemed HBCUs period. It makes sense to have it in the largest city in the state...
Youre wrong in your assumption that Raleigh couldn't handle it, though

Raleigh has the infrastructure for it. But go ahead and get your shine on in April, my brother!
The eastern HBCUs would do this in Raleigh instead of Charlotte if they had the size of the alumni base of A&T...
Enjoy these sisters here, we got em like that

how long you here for? Come pull up if you get some free time!