# Send appointment reminders from Google Sheets with Gmail: n8n workflow

> Started by a clock, and works across Gmail, Google Sheets and Slack. 17 steps, 1 branch: a working afternoon to understand properly.

Source: https://millionrounds.com/workflow/send-appointment-reminders-from-google-sheets-with-gmail (Millionrounds; every figure on the page links to its filing or article)

[Automation library](https://millionrounds.com/workflows) · [Scheduling](https://millionrounds.com/workflows?category=Scheduling#library)

# Send appointment reminders from Google Sheets with Gmail

Started by a clock, and works across Gmail, Google Sheets and Slack. 17 steps, 1 branch: a working afternoon to understand properly.

Medium

[Download free](https://millionrounds.com/login?next=%2Fapp%2Fworkflow%2Fsend-appointment-reminders-from-google-sheets-with-gmail)

**17 steps** Medium: a working afternoon

**1** Branch: places the flow splits

**0** Loops or waits

**3** Services it connects to

## The flow

Starts it 3 Logic 6 Service 8

The steps in the order they run, from what starts it.

- 1 **Every Morning at 9** Schedule trigger *Starts it*
- 2 **Two Hour Reminder Check** Schedule trigger *Starts it*
- 3 **Workflow Error Trigger** Error trigger *Starts it*
- 4 **Get Appointments** Google Sheets *Service*
- 5 **Get Today Appointments** Google Sheets *Service*
- 6 **Alert Front Desk on Workflow Failure** Slack *Service*
- 7 **Filter For Tomorrow** Code *Logic*
- 8 **Filter Next Two Hours** Code *Logic*
- 9 **Filter Out Cancelled** Code *Logic*
- 10 **Send Final Reminder** Gmail *Service*
- 11 **Has Valid Email** If *Logic*
- 12 **Build Summary** Code *Logic*
- 13 **Send Reminder Email** Gmail *Service*
- 14 **Flag Missing Contact Info** Set *Logic*
- 15 **Front Desk Summary** Slack *Service*
- 16 **Mark As Reminded** Google Sheets *Service*
- 17 **Alert Front Desk Missing Info** Slack *Service*

## How it's built

- **Starts on:** A clock
- **Steps:** 17, with 1 branch
- **Size:** Medium: a working afternoon
- **Connects to:** Gmail, Google Sheets, Slack
- **Model:** None. This is plumbing, not judgement

## Questions

What does it need to run?

An n8n account, plus your own Gmail, Google Sheets and Slack accounts. You connect your own accounts after importing it; none are included.

What starts it?

It starts on a clock.

Does it use AI?

No. Every step is fixed logic or a call to a service, so it does the same thing every time.

How long does it take to set up?

Plan an afternoon. 17 steps is enough that you should read each one before running it.

How do I import it?

Copy the workflow, open a new workflow in n8n and paste. The steps appear on the canvas, ready for your own accounts.

**Before you run it**

Nothing here has been tested by us. It is somebody's working automation, read and described from its own steps. Treat the connections it wants as a list of accounts it will touch, and read the 17 steps before you point it at anything that matters.

## Run it in n8n

- **Create your n8n account** Free to start. n8n is where the workflow runs. [Create an n8n account ↗](https://millionrounds.com/n8n)
- **Download the workflow** Free with a Millionrounds account. [Download free](https://millionrounds.com/login?next=%2Fapp%2Fworkflow%2Fsend-appointment-reminders-from-google-sheets-with-gmail)
- **Paste it into n8n** Open a new workflow in n8n and paste. Then connect your own accounts.

Stored with the author's traces removed: canvas notes, instance identifiers, saved credential names and any live document they had left behind.

## Connects to

Each opens the other workflows that use it.

[Gmail](https://millionrounds.com/workflows?service=Gmail#library)[Google Sheets](https://millionrounds.com/workflows?service=Google+Sheets#library)[Slack](https://millionrounds.com/workflows?service=Slack#library)

## Workflows like it

Also scheduling, with the same services where possible, closest in size first.

- [**Create departure handover checklists with Google Calendar** 17 steps · Asana, Google Calendar](https://millionrounds.com/workflow/create-departure-handover-checklists-with-google-calendar)
- [**Fill cancelled appointments from a waitlist with Google Sheets** 17 steps · Google Calendar, Google Sheets](https://millionrounds.com/workflow/fill-cancelled-appointments-from-a-waitlist-with-google-shee)
- [**Onboard new hires with Google Workspace and Google Calendar** 17 steps · Email, Google Sheets](https://millionrounds.com/workflow/onboard-new-hires-with-google-workspace-and-google-calendar)
- [**Schedule approved LinkedIn page posts from Google Sheets** 17 steps · Google Drive, Google Sheets](https://millionrounds.com/workflow/schedule-approved-linkedin-page-posts-from-google-sheets)
- [**Automate HVAC service scheduling with Google Calendar** 17 steps · calls a model · Gmail, Google Calendar](https://millionrounds.com/workflow/automate-hvac-service-scheduling-with-google-calendar)
- [**Build a personal AI assistant with Telegram and OpenAI** 17 steps · calls a model · Gmail, Google Calendar](https://millionrounds.com/workflow/build-a-personal-ai-assistant-with-telegram-and-openai)