A week with a major release has two different days in it. The day before, the market waits. The day of, it reacts. They ask different things of an option, and a plan written for one fits the other badly.
The day before: a market that waits
Large participants tend to hold off on new positions until the number is known. With fewer of them pressing, the index often trades a narrow range on lighter volume. Realized volatility falls.
Implied volatility does not fall with it. The options that expire after the release still have the event ahead of them, so their price holds up or climbs. That gap between a quiet tape and firm option prices is the ramp into a catalyst.
Decay looks different on the eve
An option normally loses a little value each day as time passes. Before an event that loss can be hidden. The option still sheds time value, but rising implied volatility puts some of it back, so the price barely changes.
This can read as a free hold. It is a deferred bill. The value propping up the option is the event itself, and it leaves once the number is out, as the post-event crush describes.
An option that expires before the number
A contract that expires the day before the release never sees it. It is priced on a waiting session alone, so its implied volatility can sit well below the contract expiring one day later. Two neighboring expiries can look like different markets. Which expiry holds the event explains the split.
The day of: the release and the rest
Most major releases land before the stock market opens. The first reaction happens in futures, and the cash session opens with the gap already made. The expected move that was priced the night before is now partly spent or exceeded, and implied volatility on the event expiry drops quickly.
What remains is an ordinary session with an unusual start. The opening range is often wide, and positioning that was built to wait gets adjusted through the morning.
Reading the two days on the dealer map
On the eve, a quiet index pinned between its walls is what a waiting market looks like. It says little about the next day. On the day, the first question is where the open landed against the levels drawn before the print, which is the idea in how the overnight map gets repriced.
The Trader dashboard shows the expected move, the gamma flip and the call and put walls on SPY, QQQ and IWM on both days, with Dr. NoVo’s written reads. A markets SI can tell you where price sits against those levels. It does not tell you which way the number falls.