HTC One M8 - Manual (Page 157)

Dismissing or snoozing event reminders
If you have set at least one reminder for an event, the upcoming event icon will
appear in the notifications area of the status bar to remind you.
1. Slide the Notifications panel open.
2. If the notification shows that there are multiple reminders, tap it to see all the
reminders. You can then choose to snooze or dismiss them.
3. If you see a single event notification, spread your two fingers on the notification
to expand it. You can then:
§ Tap Snooze or Dismiss. Or drag the notification left or right to dismiss it.
§ Tap Send mail to send a quick response to the meeting attendees.
To edit the preset quick responses or add your own, open Calendar, and then tap
> Settings > Quick response.
If you don't want to dismiss or snooze the calendar reminders, press from the
Notifications panel to keep them pending in the notifications area of the status bar.
157 Calendar