If events from your Cozi calendar appear multiple times on your Apolosign device, the cause is on the Cozi side: when an event is assigned to Cozi's default "Everyone" member, Cozi's export generates it as multiple separate data entries (one per family member), which triggers duplicates on third-party displays.
You can fix this completely in about 5 minutes:
Step 1: Clean the app
In your Apolosign App, go to your calendar settings and unselect/delete the shared Cozi link that is causing the duplicates.
Step 2: Create a virtual member in Cozi
Log into your Cozi account and add a new family member named "All" (or "Family").
Step 3: Re-assign events
For shared family events, instead of assigning them to the system's default "Everyone", check the box for this new "All" profile.
Step 4: Sync the new link
Grab the individual shared iCal URL for this "All" profile from Cozi, and paste/bind only this link into your Apolosign App.
Once completed, your calendar will look clean and the duplicated birthdays or events will be gone.
If duplicates still appear after following all four steps, contact us at support@apolosign.com with a screenshot of your calendar.