I'm pretty sure that I was originally a member of alt.suicide, which I remember as this weird mishmash of people wanting to find useable suicide methods, people just wanting to vent about their crummy lives, people who were there seeking support in a time of desperation, people there to make fun of the suicidal people, people who were there to try and see if they could actually drive someone to suicide, people who figured that it was a great place to proselytize about their religion, and who knows what else. It wasn't actually very useable for any of those purposes.
Alt.suicide.holiday was kind of a joke, as I remember it. It was sort of a parody of the "real" suicide newsgroup, or a place to post commentary about it or about suicide in general. I didn't find it clever or funny (the vast bulk of Usenet wasn't), and it's likely I never posted there. A lot of people swear A.S.H. was worthwhile, and it may well have been, either before or after the early-to-mid 90's, which is when I had access to it. (Back in the day, the only way to get on the internet was to have access to a computer lab on a university campus. Once you graduated, the plug was pulled, as weird as that sounds now.)