If you have any plans to fish Hosmer in the near future plan to get up there very early in the morning before the hoards of boaters. Or go about 5 PM when a lot of folks are off the lake and headed for dinner.
There is a good callibaetis hatch so you can see callibaetis in the late morning, afternoon and evening depending on the stage. Damsels are getting active so nymphs are essential and soon the fish will crush adults. Alder flies are hatching (Black Elk Hair Caddis is a good match), Long Horned Sedge, and some Traveling Sedge and now at dusk Caenis Mayflies which are matched with Trico Duns and Spinners (bring 7x tippet for this hatch!).
Balanced Leeches are also a great bet at Hosmer.