I ask - but not in an effort to hold him accountable, just because recovery is 'normal' conversation around our house these days.
I don't ask for a lot of detail, more like "How was Saturday's meeting?"... but he often volunteers more info about the speaker, what he got out of it, etc.
In the first 90ish days though, I hardly asked at all. Like choublak said, it was obvious he was attending & there was no reason for me to rehash it all with him afterward. After he got further in his recovery, he opened up more & I felt comfortable asking more.