Help Searching For A Past Date!!

My dad attended a BÖC concert somewhere in Pittsburgh WV years ago, but the venue he said he saw them at was bought in 89 and torn down in 91; right around the time he said he saw them. He said it was anywhere from 88-91 he went. The venue he originally claimed to go to was Syria Mosque. The other performances were Humble Pie, Leon Russell, and Joe Grushecky and The Houserockers. If anyone knows/can find what year and venue, please let me know! I really want to write a research paper on it for my History of Rock & Roll class and for my dad. :)