Flute: Both A and Bb are valid tuning notes on most models of flutes. The HJ is tuned to A too.
Oboe: A. There isn't really a good way to tune an oboe unless the kid is listening.
Bassoon: A, and F (check for coverage on the whisper key).
Clarinet: Two tunings, three if you want to get REALLY technical. You need an open G to tune at the barrel, and an in-staff C or B natural to tune the center. I've heard of some clarinetists that tune a high-G in the center joint and tune a B natural to actually tune the bell, but that's not a common thing at all. It matters more with larger clarinets - alto, bass, contra, etc.
Saxophone: B/C, and F#. That tunes concert A and concert Bb on Eb and Bb saxophones, even if you are getting an extra note here or there.
Trumpet: C. Period. I slur GABC. The partial that Concert F is on is a bit SHARP. If you pull out to make Concert F in tune, you're going to make the entire rest of the horn slightly flat - which matters a great deal when you're talking about D and E at the top of the staff.
F Horn: Depends upon wrap. But, assuming you have a Kruspe wrap, I tune open C, trigger C, then open valves (2, 1, 3), then trigger valves. If I am tuning a Geyer wrap, I tune the trigger first, then open, then the valves.
Trombone: Same issue as trumpet. (You can do an FGABb here too) Tune an above-the-staff Bb, then tune a C concert for the trigger.
Euphonium: See above. FGABb as trumpet. Then tune the 4th valve C concert. If compensating, double-check tuning there too.
Tuba: As Euphonium.
Percussion: Consult a mental health professional - you're nuts. Then send your bars off to a specialist to make sure they've been tuned. NEVER tune your own bars!
Most of the time we tune to Concert F because it's a solid middle of the road note for instruments, yet for 4 of the 5 brass instruments, it's *not* in tune.