These are always tough questions,
However, I am much more of a mind that the issue of scandal is greatly misunderstood and overblown.
That is not to say I think anyone should engage in scandalous behavior; but the first question is, who is going to be scandalized?
Those at the wedding are the most likely group to come to mind.
And how likely are they to be scandalized? Think about it - they are there too… which would imply generally, that they are not scandalized by the wedding ceremony (that is, it means little or nothing to them what the Church teaches on the matter).
And if it matters little to them what the Church teaches, what is the likelihood they will be scandalized by you being there? Slim and none.
It is far more likely that someone who is true to the Church and a practicing Catholic might be scandalized (particularly if they have never had this issue themselves, or if they had it, they didn’t go). The way to deal with that is to not broadcast all over that you are going. This is a personal matter, and one that is best kept that way. Sometimes we seem to have a need to engage in what I call verbal vomit - talking about all that we do to everyone within earshot. Discretion is the better part of it.
And if someone who is likely to not approve of your going is to ask, they have no right to know the answer. I would not lie; I simply would give them a non-answer, and if they pursued it after that, another. Busy bodies often have a need for a bit of juicy gossip, and the need to stand in judgment of others. You have no need morally or otherwise to fill their need.