Quick fix to ensure events with skyboxes remove them at the end.

code/modules/events/dust.dm

@@ -17,6 +17,7 @@
 		dust_swarm(severity, affecting_z)
 
 /datum/event/dust/end()
+	..()
 	command_announcement.Announce("\The [location_name()] is no longer in danger of impact from space debris.", "Dust Notice")
 
 /datum/event/dust/proc/get_severity()

code/modules/events/ion_storm.dm

@@ -68,6 +68,7 @@
 				bot.emag_act(1)
 
 /datum/event/ionstorm/end()
+	..()
 	if(prob(50))
 		spawn(rand(5000,8000))
 			command_announcement.Announce("It has come to our attention that \the [location_name()] passed through an ion storm.  Please monitor all electronic equipment for malfunctions.", "Anomaly Alert")

code/modules/events/meteors.dm

@@ -49,6 +49,7 @@
 	return activeFor + ((30 / severity) * waves) + 10
 
 /datum/event/meteor_wave/end()
+	..()
 	switch(severity)
 		if(EVENT_LEVEL_MAJOR)
 			command_announcement.Announce("\The [location_name()] has cleared the meteor storm.", "Meteor Alert")