Jason,
I don’t know what you’ve got for boats but if you can get under the bridge at Yellow Lodge, which enters Little Yellow Lake, that’s the beginning of your best panfishing opportunities. I’ve found bullheads too but I wasn’t trying for them.
If Little Yellow is being uncooperative, take some time and learn the Yellow River outlet. There are some pools back that way and they’re excellent spots for panfishing. Plenty of weeds and cover, flats and even stumpfields.
Your opportunities on the Yellow system are large and numerous so let me encourage you to simply take some time and explore around, well in advance of your family gathering. The more you know, the better you’ll do.