A summer feed would be of benefit and I would recommend a 12-4-4 fertilizer. This has a trace of iron in it and will help toughen up the grass as well as adding colour.  Mowing and watering will be the main task during July. Get a strimmer and do as much mowing of the outside of the pitches as possible. Make the place as tidy as you can. If it is dry it will not grow back as fast and the whole ground will look attractive to any Summer visitors.