While trying to find the word I was looking for that means
a fortuitous coming together of events (which I was unsuccessful at, and darn it, it's on the tip of my tongue),
I came across the following at Thesaurus.com, which seems to use mostly Roget's:

"[Nouns] chance, indetermination, accident, fortune, hazard, hap, haphazard, chance medley, random, luck, raccroc, casualty, contingence, adventure, hit; fate (necessity) [more]; equal chance; lottery; tombola; toss up [more]; turn of the table, turn of the cards; hazard of the die, chapter of accidents, fickle finger of fate; cast of the dice, throw of the dice; heads or tails, flip of a coin, wheel of Fortune; sortes, sortes Virgilianae."
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Has anyone heard of the word raccroc before? I don't think I'd heard tombola, either.