Well, just my perspective/guestimate,
but I'd guess probably most on the balug-admin list aren't too likely to be horribly put off by discussions about potential speakers/topics. But *do* keep in mind that balug-admin is publicly archived, so probably should not send stuff to balug-admin that "we" or the sender (or persons/companies/institutions/entities mentioned in the e-mail) would generally prefer not to have hanging out there for the whole world to see.
references/excerpts:
Quoting jim stockford:
My guess is you all would rather i confine such posts to those specifically assigned to getting speakers