How long is the structure up for?
Depending on how long your structure is up for different legislation can affect you
You have more than three events?
If so you're going to need to consider how to mitigate against this
What are the main sound sources?
Amplified music has a much greater impact on the environment but even unamplified sources can cause a problem
You have bands and DJ's performing
Amplified music will travel a lot further, especially the bass frequencies. If you're not able to control these then your neighbours could be disturbed.
How far is the nearest property?
We call this the nearest noise sensitive dwelling (NSD) and the distance to it has the largest influence on the impact of noise
A house 95m's away
Less than 100 meters and you're in a highly noise sensitive environment. Without suitable mitigation then even unamplified noise like guests laughing can be considered a nuisance