There are couple of reasons why you may not see events in Nowsta but you do see them in Caterease.
The event is still loading. Sometimes, transfers from Caterease can take a minute or two to appear in Nowsta. Wait 60 seconds and then try refreshing the Caterease feed page to see if the event appears.
The event was not properly transferred from Caterease. For directions on how to send events over from Caterease, see the transferring events section of this guide.
The event successfully transferred but was archived in Nowsta afterwards. If an event is transferred to Nowsta and then archived within Nowsta, it will not be visible from the Nowsta calendar page.
Watch this quick video to learn how to restore an event that has been previously archived.