I'm looking at having a garden party for my birthday mid summer with all of our close friends (perhaps 30 people) and we live in a close knit new build estate where everyone's on top of each other. We are semi detached. We will have music and will inform both neighbours behind us and next to us. We have told guests that the party will start at 2:30 and finish at 11 as our neighbours have young children. Is this reasonable?