After elections event

[TheNeighbour]

Hey, I want to create an automatic event that gives me the option to enact the Ruling Party Only political reform on upper house. Basically I want that after an election the winning party becomes the only upperhouse party.

Unfortunately I suck at programming so this is all i have so far.

(country/province)_event = {
    id = x
    title = "Occupy Parliament!"
    desc = "We have the opportunity to seize the upperhouse and establish a new order."
    picture = "(picture name)"

        #the four lines below are only needed if they are yes
    
    is_triggered_only = no        #only fired by another event or manually
    major = no                   #major event has no picture example: great wars enabled
    fire_only_once = no           #can only be fired once through triggers
    allow_multiple_instances = no #Allows to fire several at once?

    trigger = { #what triggers the event
        (triggers)
    }
    
    mean_time_to_happen = {
        months = (months)
        
        modifier = {
            factor = (factor)
            (trigger)
        }
    }
    option = {
        name = "Proceed!"
        political_reform = party_appointed
        }
        
    }
    option = {
        name = "This is undemocratic!" #no effect
    }
}

Please provide me with any links I can check out in order to create my event