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You set auto_now_add = True
for time_delay field so django will not add this field to the form
class EventAdmin(admin.ModelAdmin):
list_display = ('title', 'start', 'contact_time', 'user', 'fin', 'frequency', 'one_file_',)
fieldsets = (
(None, {
'fields': ('title','start', 'contact_time', 'is_cancelled', 'calendar', 'user', 'description', ('frequency', 'fin' ), 'activated', 'one_file',)
}),
)
readonly_fields = ("time_delay",)
Source:stackexchange.com