Floating events are not implemented
in CalenGoo for iOS yet, but they will be added soon, probably with version 1.5.16. Floating events are events that are moved from the past to the current day until they are marked as completed. Then they will stay on that day. Future floating events are not modified.
It is also possible to make recurring events floatable so that only single events will start to follow on the current day until they are completed.