Hi Thomas,
Thank you for contacting Syncfusion support.
We have checked the report issue “Calendar doesn’t contain InlineItemTemplate and InlineItemTappedEventArgs” in Xamarin.Forms and it is working fine from our side. We have checked with our latest Volume 4 release update version 16.4.0.42. We have prepared sample for the same with the provided code example, please find the following sample.
We hope this helps. Please let us know with product version you’re using, if the issue still occurs in your side.
Regards,
Subburaj Pandian V