How do I find a free/volunteer interpreter??

I attend a spiritual AA meeting on Thursday nights from 7p to 8p. One of the regular members has been sober over 5 years and is deaf & cannot speak. He really needs someone to sign for him. I am currently writing down, as best I can, everything that the other group members say. Bob doesn't have anyway to share his experience, strength, & hope with the rest of us because the deaf association in Grand Rapids (Michigan) can only provide 1 interpreter per meeting & she is currently going to a meeting at the same time, same club, but a different meeting. The group we attend is non-smoking. If you know any sources I can contact that may be able to help out, please let me know.
Thankyou.

Hello I am Hoh myself and want to answer you go call deaf and hard of hearing services in Grand Rapids 616 732-7358 zip is 49503 this may help you to find an interp for the deaf man,I know it is hard to write and read and miss so much.hope I am right you are in another place and he is there. look under deaf and hard of hearing services where ever he is on the net .I really hope you find it for him The Lord Bless you .I am in cal .I am unable to help but I pray you find something to help him My youngest son is going through aa as well he is sober now for 6 years because of it and the Lord is in his life now as well. God Bless Shalom .Vickie