Where to find Emit if you bulldozed Magnolia Blossom
Tl;dr version: If you built something on the lot where Magnolia Blossom used to be, be sure to check inside the house/building for him.
I bulldozed Magnolia Blossom Park years ago and put a house on the lot. I only have a much smaller version of the park on another lot. So I wasn't sure if this step in the event would work correctly.
I went to the lot where the park used to be and it registered me as being there, but I couldn't find Emit anywhere. Eventually it checked "introduce yourself to Emit" even though I still hadn't found him. But I got stuck for awhile at the next step where you are supposed to ask him about objects. As I hadn't actually talked to him, he wasn't in my list to call. My Sim spent several Sim hours just wandering around the area looking for him. I was about to post about it here to see if anyone else had the same problem, when it occurred to me he might be in the house I'd built on the lot.
That's where he was, just chilling on their couch. Definitely a smack yourself in the forehead "duh" kind of moment.
Edited to add that Magnolia Blossom is/was the center 64x64 lot in Willow Creek with a pathway and other park features around it in the world.