Southern Athletic Field Mule Mix 816 Conditioner can be applied anytime after the field has been graded. Just add as needed to have the right amount (customer preference or 1/8”-1/4” is a good even coverage). When there is a heavy rain and need to get more on the field then you can add some at that time to be able to get more material to absorb water. Using a nail drag (pencil drag) will turn the clay and conditioner over to allow for the sun/wind to hit it better and the field to dry out when it is too wet to play. If there is enough material on the field then it will take a little time to dry but that is normal practice in being able to use it that way.  If you have a wet area that needs to be dried out quicker then you would use more in that area for the time being and then spread it out later with the drag or a rake and even it back out. As far as how often, that will depend on how you like the coverage of the conditioner. The manufacturer typically suggesst to have anywhere from 60-80 bags on a baseball field and 80-120 bags on a softball field  at all times for it to be about the right amount of coverage. Again, a lot of this depends on your preference as well.