My brother works for a possible supplier to the project our residents' panel will discuss

The invitation describes us as an independent residents' panel. At Sunday lunch, my brother mentioned that his employer might bid for the town-square lighting work we're being asked to discuss.

I joined because I use the square after evening shifts and wanted residents' experience included. I haven't seen any bids, my brother hasn't told me prices, and I don't know whether his employer will actually apply. The panel's first task appears to be discussing what people need from the square, not choosing a supplier.

My brother says mentioning his job will make an innocent connection sound suspicious. Another panel member says I should leave immediately. I haven't yet seen the panel's guidance on interests or how it handles connections like this.

What should I tell the organiser before the first meeting? I want to be open about the connection without deciding for myself that it is either irrelevant or an automatic reason I can't participate.