What I would keep eye on will be powder mildew, since the pathogen does not require water for infection. Sulfur is a good material, and you can add powdery mildew materials, such as Quitec, Vivando, Torino, DMI, and SDHI to provide extra protection. When you spray a sulfur product, make sure the sprayed material will be dried up before temperature gets above mid-90F. If the leaf surface is wet with sulfur when the temperature gets high, it can cause phytotoxicity. Since powdery mildew thrives under shaded conditions, canopy management is important too (as you can see on the pictures above).

You may need to consider an application against Botrytis and ripe rot at bunch closure, which is good timing for you to make sure your spray materials will be delivered to inside of the cluster structure. For the list of materials against powdery mildew, Botrytis, and ripe rot, please refer to my previous presentation slide.