Why is it wrong to attend a wedding of a Catholic who is not getting married in the church and is waiting on an annulment?
The following links should assist you in understanding the Catholic Church’s teaching on attending weddings. If you have any further questions or concerns that are not answered by these links, please contact Catholic Answers directly.
Should I attend a civil marriage between two Catholics?
Can I attend the civil wedding of two baptized Catholics?
What are the rules for attending weddings?
Why doesn’t the Church forbid Catholic attendance at invalid marriages?