Ours is actually 2 seperate sections. We have one section where it goes year by year, and will list like Geeky Penguin's...

1971
Jenny A has taken a high-level position with Big Name Firm

1993
Bobby B has been elected to the school board of his town.

And then a seperate section that's lumped together, just under the title "Marriages" where it will list

Suzy Doozy (98) to Jack Smack (96)
Bill Hill (99) to Anne Mann (no year if not an alum)

etc.