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Send appointment reminders from Google Sheets via Gmail and Slack

by Redowan Ahmed Farhanadapted from n8n official workflow galleryUpdated Aug 2026
RequiresCCodeGmailGmailGoogle SheetsGoogle SheetsSlack
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ScEvery Morning at 9Every Morning a…Get AppointmentsCoFilter For TomorrowFilter For Tomo…CoFilter Out CancelledFilter Out Canc…IfHas Valid EmailSeFlag Missing Contact InfoFlag Missing Co…Alert Front Desk Missing InfoAlert Front Des…Send Reminder EmailSend Reminder E…Mark As RemindedCoBuild SummaryFront Desk SummaryFront Desk Summ…ScTwo Hour Reminder CheckTwo Hour Remind…Get Today AppointmentsGet Today Appoi…CoFilter Next Two HoursFilter Next Two…Send Final ReminderSend Final Remi…ErWorkflow Error TriggerWorkflow Error …Alert Front Desk on Workflow FailureAlert Front Des…12345678910
1/5
FLOWS
STEPS · 10
Runs on a schedule

Quick Overview This workflow runs daily at 9:00, reads appointments from Google Sheets, emails next-day patients reminders via Gmail, and posts a reminder count to a Slack channel. How it works Runs every day at 9:00 using a schedule trigger. Reads all appointment rows from a specified Google Sheets worksheet. Filters the rows to keep only appointments whose Date matches tomorrow’s ISO date (YYYY-MM-DD). Sends a personalized reminder email for each remaining appointment using Gmail. Counts how many reminders are sent and generates a summary payload for tomorrow’s date. Posts the reminder count summary to a selected Slack channel. Setup Connect Google Sheets OAuth and set the target spreadsheet and sheet, ensuring columns like Patient, Email, Date, and Time exist. Ensure the Date values in Google Sheets are stored in a format compatible with the filter logic (ISO-style YYYY-MM-DD at the start of the field). Connect Gmail OAuth and update the sender account, subject, and message text as needed. Connect Slack OAuth and select the channel where the front desk summary should be posted.

Tags

n8nreference-onlygmailgoogle-sheetsslack
Connects
CCodegmailGmailsheetsGoogle SheetsSlack
CategoryGmail
Triggermanual
Complexitycomplex
Nodes17
AddedJun 17, 2026

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