When adding Javascript to Sharepoint pages it is useful to know if the page is in edit more. This allows your script to react appropriately. The code below tests if the page is in edit mode.
A Sharepoint calendar list "Start Time" defines when an event starts. You can't filter on start time because "Start Time" does not appear in the list of available columns within the filter settings.
Configuring Kwizcom Cascading Lookup Plus Field for Sharepoint isn't always clear even if you've read the user guide. This YouTube video makes it a bit clearer.