Let me tell you what works for me and hopefully others chime in.
Early Rapala's on the surface. Next time you see Dale ask, as he is the one who turned us on to this. Original floating with darker patterns like the Perch on overcast days and Lighter patterns like the Blue and Silver on sunny mornings. As the morning strolls on they may need to be slightly deeper. Countdowns or sinking. Smaller sizes work for quantity, larger for quality.
Wedding bands in assorted colors. Black works all year but best in winter, green, orange and pink work in spring and summer, either trolled alone or with a gangtroll. If fishing slows by late morning then lengthen the leader, I have gone up to 5'.
Apex trout killers in 1.5 or 2" sizes. Rainbow pattern, frog, orange, police car are my favorites.
Gangtrolls and pieces to make your own. This would be nice for Wedding bands also. Face it fisherman can be cheap but many of us like to tinker and muck around with ideas that might work. Having the ability to change and try new things is very usefull. If you decided to bring in materials for creating gangtrolls and had a saturday where you were set up for people to come try making thier own you might drum up some business. I know my kids would be all over making thier own. Lots of different spoons, beads etc.. out there for creative types.
Gulp plastics and Power bait. I won't go there except to say others know way more than me on what they want.
Not yet a bass guy but plan on trying more this summer.
A basic fly selection but this area can get carried away. I am not yet tying my own but will in the future. Currently by the basics I need.
I know others use a variety of spoons, spinners, and wobblers of many assortments but I have not gone far in this direction. Maybe there are others who have their favorites will let us know what works.
Lastly and most important, WORMS, WORMS, WORMS! Where would we be without them.
O yeah, A fishing Derby! I know that the Loghouse pub has one but I never saw any signs or heard of it till they were on the water with us. Lady running it said only 10 guys this year. I know there are way more regulars than that and the Elk Lake Derby has a big turnout in crappy weather with very few fish. Just a thought but maybe something to look at for next year.
Hope that helps as I tend to ramble but love talking fish.