Radial Rotation of Block Origin Plane

Hi Everyone,
I am relatively new to Grasshopper and I am trying to insert a block at particular points along some curves. This is for seating in a theater project. I have gotten the points to where I want them (they need to be staggered at the centerline of the arcs) and I seem to be able to insert my Rhino block of a seated person. But I want the blocks to be rotated to face the centerpoint, so radially. I think this must involve rotating the origin plane of the blocks but I can’t quite figure out how to do that. Any tips?