Divorces, marriages, births, graduations are all events.
It is possible to build communities for these topics. But the member turnover is high. The sense of community is low. It's largely a game of demographics, niching and promotion.
You need to have enough people to sustain the community, a specific enough niche to become established, and enough promotion to ensure people find the community (keeping away the spammers is also a problem).
The hardest part is retaining great knowledge members have shared.
Football (soccer), chess, accounting, Lady Gaga are all interests. Our interests change around once in a decade.
It's far harder to build a community around events. Far better to find a related interest.
On October 29th to 30th, the world's top 250 community professionals are going to SPRINT in San Francisco. Will you be one of them?