I know of no reason that it would be necessary. I would wonder if you can make it through the last half of July, the whole month of August and into September without irrigating the lawn. That's a long stretch. Also, if you have any trees in the lawn area, you may well damage them without irrigating. Not sure what your "sprinkler guy" has to do with any of this. I call for professional help once each year to certify my back flow preventer as required by law. Other repairs are almost always a DIY job.