In addition to what the other two attorneys have stated, go to the next city council meeting and report this. It could be they need a permit for this and don't have one (which is a way to stop it), or, they could have the proper permit, but the city officials are not aware of the disturbance it causes. If they are violating a city ordinance, city code enforcement should get involved.
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Most counties and municipalities have noise abatement ordinances. If the noise is loud enough to hear in your house several blocks from the event, you should call the police and report the problem. You might also talk to the church about your concerns. If you are not able to get satisfaction in this way, you may want to hire an experienced lawyer in your area. The lawyer may be able to get the church's noisy activities enjoined as a nuisance.
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Begin with your city or county code enforcement division. You might also check with the parks department regarding the use of the park. For events that size it is likely the church is having to obtain a permit or at least some type of reservation. Discussing concerns with code enforcement or the department overseeing park use may give you an opportunity to find out what restrictions are in place and make sure the church is complying. You might also want to find out if this is a problem shared by your neighbors. There will likely be some strength in numbers if a large portion of the neighborhood is raising the same complaint to the city/county.