If the pegs are slipping, they need to be looked at. Don't try to jam them in to make them hold, or knock them free if they are stuck-you risk splitting the pegbox. Humidity Changes in humidity can be quite damaging to your instrument or bow. Wood and horsehair shrink when it gets dry, and glue softens when the air is excessively hot and damp. You can't eliminate the problem, but you can mitigate it.
Air conditioning helps reduce excessive humidity.
You can attach a perforated plastic soapdish to the inside of your case and keep a dampened sponge in it. Occasionally a part of the top or back will come unglued from the sides. If the instrument is buzzing badly, and you have no choice but to use it, slip a small piece of paper in the opening-that should be enough to stop it until you can get it glued. Since the neck responds to changes in humidity, you can expect a certain amount of variation in the string height-which means how high they feel under your fingers. If you can't find it, we'll take a look.