Hi Karen-
Boy, thats a tough one. There are a number of churches in Chicago (past & present) that have TABERNACLE in the name. None that I know of named specifically "Tabernacle of Chicago".
I am assuming you don't have an address for the church, but perhaps if you know the following it might help in narrowing down the search:
-address or area of Chicago where the bride or groom lived
-Ethnicity of bride and/or groom
-Religious affiliation/denomination
Paul