However, is there a dispensation for one's son or daughter?
You should avoid the wedding altogether and just attend the reception.
1) You should avoid the NO out of love for God and the insult that such an abomination causes Him.
.
2) You should avoid the NO because we should avoid non-catholic services (especially those where there will be a) gross immodesty, b) irreverence and casual atmosphere in church, c) communion-in-the-hand.
.
3) You should avoid the NO as a sign of displeasure to your daughter, that she may see, by your good example, the error she is committing against the Faith and hopefully she will convert to Tradition in the future.