Every holiday on your calendar started out as something else — a harvest rite, a bookkeeping decision, a rodent-based weather service. These fourteen questions cover the whole year, and almost none of the answers are the ones people confidently give at parties. Lock in each guess before the reveal, and keep score.

Round One: The Spooky End of October

Begin with the date everyone takes for granted. Why is Halloween on October 31, specifically? Because it's the eve of All Hallows' Day — All Saints' Day, November 1 — and “Halloween” is simply “All Hallows' Eve” worn smooth by centuries of use. The deeper roots reach back further still, to Samhain, the Celtic festival marking the end of the harvest and the start of winter, a night when the boundary between worlds was said to thin.

Next: what did trick-or-treaters do before candy existed as a demand? In medieval “souling,” people went door to door offering prayers for the household's dead in exchange for small spiced breads called soul cakes. In Scotland and Ireland, “guising” added the costumes — but the visitors had to earn their treat by performing a trick first: a song, a verse, a party piece. Modern kids have negotiated considerably better terms.

Round Two: The Winter Stretch

Now the season of maximum holidays, starting with an honest hedge. Why is Christmas on December 25? Nobody knows for certain — the Bible names no date. The two leading scholarly theories: the church either placed it near popular Roman winter festivals, or calculated it as nine months after March 25. Historians still argue; you get the point for knowing it's genuinely disputed.

Boxing Day is more fun. December 26 has nothing to do with fights or discarded gift wrap — so what were the boxes? Alms boxes and Christmas boxes: churches traditionally opened their collection boxes for the poor the day after Christmas, and servants and tradespeople — who worked Christmas Day — received boxed gifts and tips from employers on the 26th. Which custom named the day is debated, but every candidate involves a literal box.

On to the new year. Why does it start on January 1? Thank Roman politics: consuls began taking office on January 1 in 153 BC, and Julius Caesar's calendar reform of 45 BC cemented the date. The month belongs to Janus, the Roman god with two faces — one looking back at the old year, one ahead to the new — which is almost too on-the-nose to be real, and yet.

Two traditions to close the round. In Spain, what do people eat at midnight on New Year's Eve? Twelve grapes — one per chime of the clock, for luck in each month ahead, and yes, the pace is a genuine problem. And in Japan, temple bells ring exactly 108 times on New Year's Eve. Why 108? In Buddhist tradition, that's the number of worldly desires afflicting humankind — one toll to dispel each.

Bonus round, no charge:

Ireland's original jack-o'-lanterns weren't carved from pumpkins. What vegetable did the job?

The turnip — pumpkins only took over after the tradition emigrated to America, where they were bigger and much easier to carve.

Round Three: The Groundhog Files

February 2 deserves its own round. First: Groundhog Day didn't start with a groundhog — so where does it come from? It's Candlemas, a Christian feast day, wrapped in old European weather lore: a sunny Candlemas meant more winter ahead. German tradition watched a badger or hedgehog for the verdict; German immigrants in Pennsylvania, finding themselves short on hedgehogs, promoted the local groundhog. Punxsutawney Phil has been on the job since 1887.

Which brings us to the money question: how accurate is Phil? Commit to a percentage. Analyses comparing his forecasts to actual weather records put him around 39% — meaningfully worse than a coin flip, which is almost impressive in its own right. NOAA, the U.S. weather agency, has reviewed his record and found no predictive skill whatsoever. The professional advice, then: enjoy the ceremony, bet against the rodent.

Final tally. If you knew the soul cakes, the servants' boxes, and Phil's sub-coin-flip percentage, you're carrying enough seasonal ammunition to run every holiday dinner from here to next January — twelve grapes optional, but recommended.