Playing in a 'live' hall...one which has a lot of resonance, is a real joy. Many of us might notice that playing in a bathroom, with so many reflective surfaces (tile, glass, marble) is quite an ego boost for our tone! Live halls require more finesse from us: There is no reason to play louder in such a space. Do the opposite: Let the hall help carry your tone by backing off just slightly. Otherwise, you risk sounding a bit harsh with a slightly frayed tone. It will also help to make careful adjustments with articulation...play a bit shorter, because the hall will lengthen notes for you because it enhances the vibrancy of the sound. Dynamics need careful attention as well...bring out the piano side more than usual. Enjoy these live spaces...and let them help you create tonal magic.