Yes, you can set event reminders in QuickBooks Online by using the Invoice Google calendar. Before doing that, I suggest going to the App center inside QuickBooks. Then look for the Invoice Google calendar to integrate with QBO and to import your calendar events to your invoices so you can bill for your work.
Here's how:
Click Apps at the left panel and choose Find Apps.
Search for Invoice with Google Calendar, then select the app.
Click the Get App Now.
Follow the instructions to complete the process.
Once connected, the Google Calendar app will ask you to choose the default service you prefer when applying the recorded time from Google Calendar to an invoice. Follow these steps if you need to modify this setup:
Select Apps menu from the left panel and choose My Apps.
Find the Invoice with Google Calendar app card and choose Settings from the drop-down to open the Intuit App Centre.
Click Change from the Default service item and rate section.
Select the appropriate service item from the drop-down (price rate is associated with the item and will need to be changed in the Products and Services list within QuickBooks Online).