Adds a new spawn xmas tree landmark and also adds a new holiday, the festive season.

code/modules/events/holiday/xmas.dm

@@ -80,6 +80,10 @@
 	flags_inv = 0
 	armor = list(melee = 0, bullet = 0, laser = 0,energy = 0, bomb = 0, bio = 0, rad = 0, fire = 0, acid = 0)
 
+/obj/effect/landmark/xmastree
+	name = "christmas tree spawner"
+	var/tree = /obj/structure/flora/tree/pine/xmas
+
 /datum/round_event_control/santa
 	name = "Santa is coming to town! (Christmas)"
 	holidayID = CHRISTMAS

code/modules/holiday/holidays.dm

@@ -316,6 +316,26 @@
 /datum/holiday/xmas/greet()
 	return "Have a merry Christmas!"
 
+/datum/holiday/xmas/celebrate()
+	for(var/obj/effect/landmark/xmastree/XT in world)
+		new XT.tree(get_turf(XT))
+		qdel(XT)
+
+/datum/holiday/festive_season
+	name = FESTIVE_SEASON
+	begin_day = 1
+	begin_month = DECEMBER
+	end_day = 31
+
+/datum/holiday/festive_season/celebrate()
+	for(var/obj/effect/landmark/xmastree/XT in world)
+		var/turf/t = get_turf(XT)
+		new /obj/structure/flora/tree/pine/xmas(t)
+		qdel(XT)
+
+/datum/holiday/festive_season/greet()
+	return "Have a nice festive season!"
+
 /datum/holiday/boxing
 	name = "Boxing Day"
 	begin_day = 26