I'll be honest, I don't really care for the NBA that much, so I'm not that familiar with the workings of the league. With that said, apparently being invited to the combine is more of an honor than a formality in the NBA, and Semaj was one of the lucky fellas who pulled a golden ticket. The full list can be seen here, courtesy of Chad Ford:
The combine is the first opportunity for players to meet face-to-face with NBA representatives, so it is a big deal from the perspective of guys who need to get their names out there. Players will have physicals before running through athletic testing and drills in front of an assembled mass of NBA execs and scouts.
Presumed top picks Jabari Parker, Joel Embiid, and Andrew Wiggins will be skipping the combine, which is not common but does make a lot of sense. Those guys are locked into the top three right now and have nothing to gain by participating. The combine is more of a big deal for guys who didn't play a lot of games on TV or fringe guys trying to convince teams that they are worthy of a first-round pick and the guaranteed contract that comes with it. Obviously, Semaj falls into that second group.
Other names that I found interesting were fellow Big Easter Doug McDermott (the only other BE player invited to the combine), mid-major star Sean Kilpatrick (who I hope ends up in Europe), and Aaron Craft, the rosy-cheeked savior of the oppressed.