Should a Christian attend a same-sex wedding?

Im roman catholic and i have an homossexual friend living in Canada. what should i do if he decides to get married and invite me?

The following links should help you understand the Church teaching on attending same-sex weddings. If you have any further questions, please contact Catholic Answers directly.

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What should I do if I’m invited to a gay wedding?

What are the rules for attending weddings?