DO YOUR BEST

Make your point if you have to, but not at the expense of your skills. Make your point, but time it right, and direct it to the people who will be best helped by it. Don't let what didn't happen, what's not in place, who's not there, time, space, finances, broken promises, surprises, changes, or anything cause you to diminish yourself in any way. Lose the "I'm gonna show them" attitude. You never know who's in the room. Do your very best--EVERY time--no matter who is NOT doing their part. Just because someone got the job doesn't mean they're good at it. Don't let your indignation influence how you do yours. When the successful implementation of one task depends greatly on how well another task is done, a touchy situation can ensue.
Resist the inclination to resort to tantrums, fits and otherwise childish behavior no matter how warranted you may feel it is. Playing dumb, backing off, giving less, refusing to help, or shutting down might not send the desired message. Maybe it IS them. Maybe it IS their fault. Maybe things WEREN'T right, but don't make them worse by acting like you don't know what YOU'RE doing. Hastily timed protests reflect poorly on you and your ability, not them and theirs.
When witnessed by people who don't know the back story, a disaster unfolding before their eyes gets blamed on everyone who appears to be contributing to it. Don't find yourself being raked over the coals when you could have gotten a respectful pass or compliment.