City Festivals and Fairs
Most towns have some kind of festival every year with all sorts of activities. Your troop can run a fundraiser selling funnel cakes or hotdogs all while getting the word out about all the fun your troop has. Even if they're not selling funnel cakes, your scouts can be handing out fliers about the troop to all they meet.
Even if your troop isn't chartered by a church, there are a lot of churches needing help with their garage sales, Easter Egg Hunts, and Trunk-or-Treats. Have your scouts help out in uniform and keep their cargo pockets stocked with info pamphlets (see above).
Not to mention the fun that's to be had by marching in a parade, carrying the country's flag and a banner with the troop's website address, parades are a great way to remind the community that scouts are here to help.