Some leaders worry that if they address the situation, they'll make it worse. But an uncomfortable situation is unlikely to change (and may even get worse) if you don't do something. If you're faced with someone who is complaining nonstop about the spring carnival plans, for example, find a minute to pull them aside for a discreet conversation and ask them (kindly) what their concerns and worries are. Maybe they're feeling overwhelmed and would like extra help. Maybe they're afraid of screwing up a much-loved tradition. If you just get annoyed at the whining and vent to your friends and fellow leaders, though, you'll reinforce your own negative feelings about the person -- and never find out what's at the root of the complaining.
These articles from our archives have more details about different situations you might find yourself in, and how to handle what comes up:
Dealing With Disagreements
How To Deal With Difficult People
How To React to Critics