If you wanna wear pants to church, wear pants. What you wear at church matters not if you are giving your attention to Christ. When you "organize an event" in order to "draw attention" to an issue, you are fundamentally opposed to the purpose of attending worship services. Why not wear pants every week? Wear whatever you feel demonstrates to God your devotion to him.
I have learned that changing perceptions, prejudices or opinions is seldom accomplished by demonstrations and events, but by years of living an example of your standards. If your standards are worthy, the populace will change with you.