Can Catholics be involved in a secular wedding?

Our son, a baptized fallen away Catholic, considers himself an agnostic is marrying a former JW who also considers herself an agnostic. We as parents are both practicing Catholics. They are planning the wedding by themselves to be at a community center with an officiate and about one hundred guests. This is their first marriage for both of them. Our oldest son has been asked to be the best man and is a practicing Catholic.

How are we to respond to this situation? What comments should we make about marriage to this couple and our beliefs as Catholics?

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