Different-content sidebars showing on specific pages

I am trying to get left and right sidebars (Sidebar 1 and 2) on my Home page (done, one on the left, one on the right, no problem) and a different left and right sidebar on a different page. I have tried Widget Context to no success. I have “pages” only, no “posts”.

I tried setting up Sidebar 1 (bottom) on the “other” page, but it won’t show unless the Sidebar 1 is showing.

I’m trying to roughly duplicate the layout of this website:
Home page: http://crsalmonfestival.com
and the “different-sidebars page”: http://crsalmonfestival.com/stageof.htm

You can see the L and R columns on the home page (temporary) http://crsalmonfestival.com/wp/

Great flexible theme, yes, I donated.

https://wordpress.org/themes/suffusion/