I routinely have about 15 deer in my yard. In the winter, I feed them a bit of oats, twice a day if cold, once a day if warmer.
I divide the oats in a couple of buckets, so they don't have to fight and decide who gets the oats. Once I have filled the buckets, I thump it with my hands, and they come running out of the bush for their treat.
These are some of the deer that come to visit during the summer.