Many trading losses come from avoidable surprise. A trader enters a clean setup, then a scheduled event changes volatility, spreads widen, and the original chart logic stops mattering. An event risk calendar does not predict the outcome. It simply makes sure the trader knows when normal price behavior may stop being normal.
Indian markets react to domestic events, global events, expiry mechanics, commodity moves, and company announcements. A professional calendar puts them in one place and attaches a position rule to each event.
| Event | Main Impact | Risk Rule |
|---|---|---|
| Quarterly results | Stock gaps, IV crush, sector read-through | Reduce overnight exposure unless trade is event-specific |
| RBI policy | Banks, NBFCs, bonds, rupee, rate-sensitive sectors | Avoid oversized index option positions before announcement |
| Union Budget | Sector rotation and policy-sensitive stocks | Use smaller size and wider scenario planning |
| Weekly/monthly expiry | Options gamma, pinning, sharp intraday reversals | Define time stop and avoid late-session overtrading |
| US inflation/Fed events | Global risk appetite, DXY, yields, FII sentiment | Watch next-day gap risk in index positions |
| Scenario | Impact | Exposure | Uncertainty | Liquidity | Score |
|---|---|---|---|---|---|
| Small position before normal expiry | 2 | 2 | 2 | 1 | 8 |
| Bank trade before RBI policy | 5 | 3 | 4 | 1 | 60 |
| Single stock option before results | 5 | 4 | 5 | 2 | 200 |
Event risk heatmap: assign size rules before the market forces a decision
Every weekend, list the next week's scheduled events. Include domestic data, major earnings, central bank events, expiry dates, and important global releases. Then tag each event by the instruments it can affect. A CPI print may affect banks and rate-sensitive sectors. A crude oil spike may affect OMCs, aviation, paints, chemicals, and the rupee.
The goal is not to forecast every event. The goal is to prevent accidental exposure. If a trader holds a short straddle into a known policy event without realizing it, the mistake is process, not prediction.
During results season, create three lists: companies reporting today, sector leaders reporting this week, and stocks where options implied volatility has expanded sharply. A company's result can move peers even if you do not trade that company directly. For example, a large private bank result may reset expectations for the full banking pack.
For directional equity trades, the key question is simple: do you want overnight gap risk? If the answer is no, avoid holding through results. For options trades, ask whether the premium already prices in a large move. A correct direction can still lose money if implied volatility collapses after the announcement.
When expiry coincides with a major event, normal support and resistance can fail quickly. Short options positions face gamma risk, and long options positions face timing risk. In such weeks, the best trade may be smaller size or no trade until the event reaction becomes visible.
The options market prices how big a move it expects around a scheduled event — you can read it straight off the at-the-money straddle. If Nifty is at 22,000 and the same-expiry ATM call + put together cost ₹300 (illustrative):
| Input | Value |
|---|---|
| Nifty spot | 22,000 |
| ATM straddle (call + put) | ₹300 |
| Implied move | ₹300 ÷ 22,000 ≈ ±1.36% |
| Break-even band | ~21,700 to ~22,300 |
How to read it: the straddle price is the market's own estimate of the event move: roughly ±1.36%, or a band of about 21,700–22,300. A directional option buyer only profits if the actual move exceeds that band, because that is what they paid for. This is why 'I expect a big move' is not enough around an event — the move has to be bigger than the one already priced in, and after the event the volatility crush works against you.
Overwatch is built around live market context: news, macro triggers, and pre-market preparation that help traders see event risk before it reaches the chart.
Scheduled events can dwarf everything else. On 4 June 2024, the general-election result day, the Sensex crashed nearly 4,000 points intraday — about 6% — as the verdict surprised positioning, before recovering much of the loss in the following sessions. A trader who had that date flagged and had trimmed risk into it experienced an opportunity; one who did not experienced an accident. That is the entire case for keeping an event calendar.