Have the youth and parents, do a window washing service weekend. 3 times a year... The whole gang going round town with buckets and paper towels, out side windows only...
Have the youth and parents, help on clean up days, by providing trucks and labor to haul stuff from fellow citizens yards to the dumpster, for a $5 or $10 donation/ truck load. (Not all people have strong backs, or trucks to get the stuff to the Senior Center)
Have the Youth and Parents, host a large Rummage/Yard/City Wide Sale, and advertise it well. Invite Vendors for a fee.
For the 4th
Have a youth sponsored water balloon fight.... Sell each balloon for 1o cents a peace.... Have the tossing of the balloons at the park or Fire House...
Have a youth parent sponsored watermelon contest, a cracker whistling contest, and have people pay to play, and win a ribbon or prize.
Have, a designated Firework Location and Firework Light Brigade, at the Park, The Fireworks could be bought on site, and light on site at the proper designated area by designated people. (The fireworks, may not even be in the hands of a non designated Brigade Member. Any where else in the city they would be fined seriously. All people at the park will enjoy the event, and share each others joy and purchases.
Big screen TV or Projection of July 4th Celebration at the Capital may play at the same time. Bar b cues, and neighborly mass picnic...
All done by GT no outside entertainment paid by "Big" contributors. If there is going to be a contribution to the "Party" it is in cash to the youth teams.
Just a few ideas that will earn money and build community.