Never mix.
T10k Tourney Set (8 players)
T25 x 100
T100 x 100
T500 x 25
T1k x 75
T5k x 20 (optional)
12/12/3/7 starting stacks for 8 people. Enough extra 1ks to colour up the 25s and 100s. 300 chips but 20x T5k for 10 rebuys (optional).
Micro cash ($10 buy-in, 5c/10c blinds)
5c x 100
25c x 100
$1 x 80
$5 x 20
300 chips, $300 bank, if you need more let cash play.
If your guys are committing a max of $20/night then I'm thinking you do a $10 tourney with no rebuys and then play 5c/10c cash after (or just a $20 tourney/$10 cash game).
This is all a bit tight but workable. You know your game better than we do - so adjust appropriately. For example, I thought my guys would be happy playing micro but I was wrong. My 5c chips have never seen the felt. Similarly, my tourneys have lots of rebuys so my tourney sets need more at the top end to cover this.