Send Day-Before Google Calendar Reminders via Gmail (n8n Workflow)

Send Day-Before Google Calendar Reminders via Gmail—Automatically

This n8n workflow checks your Google Calendar every morning and sends a plain-text Gmail reminder to each invited guest for the next day’s appointment—skipping all-day events and ignoring your own attendee entry.

What this workflow does

• Runs daily at 9:00 AM (schedule-driven).
• Loads reminder settings such as business name, calendar ID, phone number, reply-to address, and daysAhead (how many days ahead to look).
• Pulls Google Calendar events within the target day’s start/end time window.
• Expands attendees so each invited guest becomes an individual recipient.
• Filters recipients:
  • Skips attendees without an email
  • Skips your own (self) attendee entry
  • Skips events without a start dateTime (i.e., all-day events)
• Sends each guest a plain-text appointment reminder via Gmail, including the appointment date/time, optional location, and rescheduling instructions.

Use cases

• Reduce no-shows by sending day-before reminders for booked appointments.
• SaaS operators coordinating consultations, demos, or onboarding calls with invited guests.
• Automation engineers standardizing consistent reminder messaging across calendars.

Technical details

• n8n nodes / tech stack: set, google calendar, filter, split out, gmail, plus a sticky note for workflow documentation.
• Requires Google Calendar credentials to read events and guest attendees.
• Requires Gmail credentials to send reminder emails.
• Configuration includes updating business name, phone number, reply-to address, and daysAhead, plus validating the cron schedule/timezone.