Should the groom's parents invite the bride's parents to dinner upon learning of the engagement?
Traditionally, yes -- the groom's parents "call on" the bride's parents after their son tells them he's getting hitched. That means they either drop them a note or make a phone call to make plans to get together, which can mean dinner or drinks at their home, dinner and drinks out, a weekend trip to the town where they live, or whatever they're most comfortable with. But it's also totally acceptable for the bride's parents to make the first move, or for the couple to arrange a group gathering to get everyone acquainted.
See More: Popping the Question , Popping the Question , Just Engaged? , Engagement/Engagement Parties