# Organise an Event with Slack and Google Calendar: n8n workflow

> Started by a clock, and works across Google Calendar and Slack. It hands the judgement calls to OpenAI.

Source: https://millionrounds.com/workflow/organise-an-event-with-slack-and-google-calendar (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)

# Organise an Event with Slack and Google Calendar

Started by a clock, and works across Google Calendar and Slack. It hands the judgement calls to OpenAI. 22 steps, 2 branches: large, and worth reading before you trust it with anything live.

Large Calls a model: OpenAI

[Download free](https://millionrounds.com/login?next=%2Fapp%2Fworkflow%2Forganise-an-event-with-slack-and-google-calendar)

**22 steps** Large: read it before trusting it with anything live

**2** Branches: places the flow splits

**0** Loops or waits

**2** Services it connects to

## The flow

Starts it 1 Model 5 Logic 8 Service 8

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

- 1 **Structured Output Parser** Output Parser Structured *Model*
- 2 **SerpAPI** Tool Serp Api *Model*
- 3 **OpenAI Chat Model** Lm Chat Open Ai *Model*
- 4 **Wikipedia** Tool Wikipedia *Model*
- 5 **Schedule Trigger** Schedule trigger *Starts it*
- 6 **Calendar Event Booking Agent** Agent *Model*
- 7 **Search for Invite Requests** Slack *Service*
- 8 **Create Event** Google Calendar *Service*
- 9 **Get Invite Replies** Slack *Service*
- 10 **Reply Invite with EventId** Slack *Service*
- 11 **Get Existing Invite EventID** Code *Logic*
- 12 **Should Create Event?** If *Logic*
- 13 **Get Old EventId** Set *Logic*
- 14 **Get Event Details** Google Calendar *Service*
- 15 **Get Invite Reactions** Slack *Service*
- 16 **Extract Invite Reactions** Split Out *Logic*
- 17 **Is Attending** Filter *Logic*
- 18 **For Each User ID...** Split Out *Logic*
- 19 **Get User** Slack *Service*
- 20 **Should Add Attendee?** If *Logic*
- 21 **Get User Email** Set *Logic*
- 22 **Add Attendee to Event** Google Calendar *Service*

## How it's built

- **Starts on:** A clock
- **Steps:** 22, with 2 branches
- **Size:** Large: read it before trusting it with anything live
- **Connects to:** Google Calendar, Slack
- **Model:** OpenAI

## Questions

What does it need to run?

An n8n account, plus your own Google Calendar and Slack accounts, and a key for OpenAI. You connect your own accounts after importing it; none are included.

What starts it?

It starts on a clock.

Does it use AI?

Yes. It calls OpenAI. Model calls are billed by the provider, not by n8n.

How long does it take to set up?

Take your time. At 22 steps it is large: read it before trusting it with anything live.

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 22 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%2Forganise-an-event-with-slack-and-google-calendar)
- **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.

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

## Workflows like it

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

- [**Assign Requests with Send Reminders Based** 22 steps · calls a model · Email, NocoDB](https://millionrounds.com/workflow/assign-requests-with-send-reminders-based)
- [**Personal assistant for calendar & tasks with OpenAI** 22 steps · calls a model · Google Calendar, Google Tasks](https://millionrounds.com/workflow/personal-assistant-for-calendar-and-tasks-with-openai)
- [**Smart email classifier & auto-responder with Azure OpenAI** 22 steps · calls a model · Gmail, Google Calendar](https://millionrounds.com/workflow/smart-email-classifier-and-auto-responder-with-azure-openai)
- [**Telegram AI Personal Assistant with Gemini and Tools** 22 steps · calls a model · Gmail, Google Calendar](https://millionrounds.com/workflow/telegram-ai-personal-assistant-with-gemini-and-tools)
- [**Generate and schedule SEO blog posts with Groq** 22 steps · Google Drive, Google Sheets](https://millionrounds.com/workflow/generate-and-schedule-seo-blog-posts-with-groq)
- [**Sync Clockify to Google Calendar** 22 steps · Google Calendar](https://millionrounds.com/workflow/sync-clockify-to-google-calendar)