Almost every nation has an independence day, what a great time to have a picnic or a special celebration. We can invite our neighbors, and other people, to have a good time with us. We can have banners proclaiming liberty to the captives.
This can be turned into an outdoor service, like the ones Jesus used to hold. We then can tell them about how we got our independence from sin and Satan and got liberty in Jesus Christ. Or it can be used to build friendships for future witnessing