Daily open rate for event email marketing | Nevent
Daily open rate over the last 4 weeks
Section titled “Daily open rate over the last 4 weeks”Business question
Section titled “Business question”“How does the percentage of email opens evolve day by day?”
This question is not asked just once: it is asked continuously, as part of the regular monitoring of communication health. A sharp drop in open rate that goes unnoticed may be signalling a deliverability problem that is affecting all your campaigns.
How is the daily open rate measured?
Section titled “How is the daily open rate measured?”Each day, Nevent counts how many emails were sent and how many were opened. Dividing the second by the first gives the open rate percentage for that day. Chaining 28 consecutive days together produces a time series with one data point per day.
The formula is simple: (emails opened ÷ emails sent) × 100 = open rate for the day. The resulting figure is the percentage of fans who opened at least one of your emails on that day.
For what constitutes a healthy open rate in the events and entertainment sector, the Mailchimp Email Benchmarks Report provides updated industry benchmarks.
What result should you expect?
Section titled “What result should you expect?”A time series with 28 values, one per day. The visualisation is more useful than an isolated number because it reveals patterns you would not see in an average:
| Pattern in the series | What it may mean | What to do |
|---|---|---|
| Sharp drop on a specific day | Deliverability problem or send to cold list | Review sender reputation and that day’s list |
| Spike on a specific day | Well-targeted campaign to a warm audience | Analyse what you did well to replicate it |
| Sustained downward trend | List fatigue or deteriorating subject lines | Review send frequency and segmentation |
| Oscillations by day of week | Your fans open more on certain days | Adjust send timing to match those days |
When does this use case make sense?
Section titled “When does this use case make sense?”- Continuous communication health monitoring — the daily open rate is the fastest thermometer for your email performance.
- Detecting deliverability problems — an unexplained sudden drop that cannot be explained by any campaign is the first warning signal.
- Validating strategy changes — if you change send timing, the day of the week or the type of subject line, the open rate in the following week tells you whether the change worked.
- Weekly email marketing metrics reporting — it is the data point that best summarises the email marketing week at a single glance.
When NOT to use this case
Section titled “When NOT to use this case”- If your sends are very sporadic (fewer than 2–3 per week): the series will have too many empty days and will lose statistical meaning.
- If you want to measure the impact of a specific campaign: in that case it is better to analyse the open rate of that specific campaign rather than the aggregated daily series.
Useful variations
Section titled “Useful variations”- Same series but by week — smooths out weekend noise, where open rate tends to be lower, and makes it easier to see the longer-term trend.
- Breakdown by channel — if you send email, SMS and WhatsApp, compare the open rate of each channel over the same time window.
- By audience segment — comparing the daily open rate of your Champion fans (RFM model) against your at-risk fans reveals very significant differences.
- Comparison with the same period last year — useful for isolating seasonality: if January always dips, it is not a warning; if it dips more than the previous year, it is.
Summary
Section titled “Summary”- The daily open rate over 28 days is the time series that best summarises the health of your email communications.
- Each point is the open rate percentage for that day: emails opened ÷ emails sent × 100.
- Use it to detect deliverability drops, validate strategy changes and build the weekly email marketing report.