The fourth Wednesday of each month. The Venue's Website does not mention it.
The blues society's own events page confirms the 'Roots of Rustbelt Blues Jam' runs the fourth Wednesday of the month at Bell Tower Brewery, as current listed programming (checked Aug 14, 2026) [s1]. Which city the brewery is actually in remains unresolved, since other information names a different city.
Both sources give the same night and time, but neither confirms recent activity.
The only description of this open mic is a 2012 feature article, now 14 years old, cited here as this listing's origin rather than as proof the event is current. A review site separately tags the shop as closed as of August 2025, though a single directory tag alone is not conclusive. Checking the article's site again on Aug 14, 2026 found it blocked [s1]. A guessed domain for the shop also failed to resolve [s2].