In the games.txt file of the events folder, there are a couple events:
That's fine, if Judea builds an arena and decides to feed some Romans to lions, that's fine. But the next listed event:
I think someone meant to type "zoroaster." 
Code:
# Games in Gods Honour
country_event = {
id = 2090
trigger = {
any_province = { has_building = arena }
not = { stability = 3 }
stability = 0
religion = judaism
war = no
}
Code:
# Games to Honour [B]Ahura Mazda[/B]
country_event = {
id = 2091
trigger = {
any_province = { has_building = arena }
not = { stability = 3 }
stability = 0
[B]religion = judaism[/B]
war = no
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