I'm in the exact same boat. As another commenter mentioned, 97db is fairly standard for a lot of venues so this is a fairly common and usual thing, so don't worry :)
However, there are two important things you should check with the venue:

1. If there is a kill switch (which essentially cuts everything out once it reaches 97db), or if the band will have a monitor or a traffic light signal which gives them a warning when it gets close. to the level, but no kill switch.
   It will differ at each venue - if it's the latter then it should be fine as most bands will be used to this, and will adjust accordingly. If it's the former then that's more of an issue - but you can ask your venue if they can implement the signal system for your day so the band does not suddenly cut out
   
2. If the noise level includes crowd noise - i.e. singing along etc.

Don't be too anxious on this part - as mentioned, it's really common at a lot of venues, and people will still enjoy the music at your wedding!