LEGO stores no longer do in-store birthday parties. But if you have a store near you, ask them about any upcoming LEGO Club events. Many locations offer monthly workshops where they open the store an hour early for members to come and build, try out various challenges, and more. This might work out well if you plan to invite just a small group or a few of your kid’s close friends. Otherwise, you can seek out local party companies that might offer building or engineering activities that you can incorporate into your party.