1. Clearly query restrictions
At the beginning, clarify with the event location whether there are any time or other restrictions regarding the volume and the party. Even if it may seem petty, have these written in the contract so there are no disagreements about the details later.
2. Have the DJ check the sound technology on site
Event venues often want to oblige tenants to use the on-site technology. Even if it sounds tempting and practical, following the motto "We can immediately tick the equipment off our list," from an event DJ's point of view, it is a somewhat questionable stipulation. It means the least effort for the venue operator, but that doesn't guarantee a good sound that does the party justice. I have experienced dreadful, sometimes ancient sound systems that rattle, crunch, and crackle - that's not the sound you want for your guests as an event planner and host. But in principle, existing sound technology is not a negative indicator. In this case, it is best to obtain a list from the event location operator with the specifications of the sound technology and have it checked by an event DJ.
3. Question any decibel limit
Watch out for the "decibel limit"! I like to put a question mark next to event locations that specify a decibel limit, as this usually indicates a deeper problem (see tip 4). Therefore, have the DJ check the level of the specified decibel limit and whether it is suitable for a party.
4. Read reviews of the event location carefully
Perhaps it's a typical German phenomenon, but at event locations, you often have a neighbour who is not a good neighbour and is very strict about party volume. Unfortunately, location operators usually don't play their cards openly, so it's advisable to ask an event DJ (I'm happy to help here) before booking the location or to look for reviews of the event location online. Unfortunately, I have already experienced venues in a court battle with their direct neighbours and continued to rent out their event location without mentioning the volume restrictions!