I can't get modules to load in the submenu on J5

On the menu called Main-Left (Special Events), I'm trying to load modules in the submenu, but I haven't been successful yet. Once I get Special Events working, I plan to do the same for all menu items in Main-Left. Any help appreciated. Please tell exactly what you fix if you're able to help. Thanks in advance.

I had one child menu item left in the menu item parent. Once I removed it, I was able to get a single module to load, but not my other three.

I see how you did it. Thank you!