Hi Susan. It’s a conflict of some kind: you seem to have a WordPress installation which is located in a sub-directory (/wordpress), and that is responding to requests like this one:
http://riverviewneighborhood.org/
However you also have either additional static pages in the web root, or possibly a separate web app, which can be seen here (with a calendar embedded in a frame):
http://riverviewneighborhood.org/events (also accessible using a .html extension)
I suspect that is the source of the problem. Can you remove or rename that static HTML page?