- Launch the Slack app on your desktop and click the tiny arrow button on the top-left of the Slack window and select Apps & Integrations.
- You will be brought to the App Directory page of Slack. Type "Google Calendar" in the available search box and hit enter.
- On the search results select Google Calendar and click the Connect a Calendar to Slack button.
- Login to your Google account and make an authorization by clicking the Allow button.
- Select which channel you want to send reminders from Google Calendar. If you want to send the reminders only for yourself just select the top most option. Don't forget to select a Google account you have set at the step above.
- Scroll down until you see the Save Integration button and click on it.
- Lastly, click the I'm done! button.
Anytime you want to remove this integration just go back to the App Directory of Slack and select the Manage menu at the top-left corner. Specify the the service you want to remove and click the trash icon.
Please note that the free account of Slack has a limited integrations (about 13) so be wise to select the services you want to integrate.