That's a good question bro, and honestly, it is quite difficult to answer because the preparation would depend on the relationship I have with the person getting married. I have skipped numerous weddings of acquaintances and even family members, dropping in only for the reception. But, in this case, it was a close friend of mine, so I had to go for the wedding. I don't do much - I pray and cover myself with the blood of Jesus and go for the wedding. Also, barring the parents and the siblings, the others are usually not required to participate in the rituals, so I am safe. In case I am asked to, I'll politely decline it or I'll pretend that I have to answer an important phone call.
To be honest, all my friends know that I am a Christian, so they do not ask me to participate in any of the rituals. I like to think that, that is a boundary I draw with my friends.
Have I answered your question, bro?