Pin 2 of the CD4011 will never go high to make the piezo transducer bother everybody because the max base voltage of the TIP120 will clamp the voltage to about 1.3V which is not a logic high voltage.
Pin 2 of the CD4011 will go high if it is connected directly to the output of the 555.
You don't say what is the minimum, typical and max forward voltage of the LEDs for us to calculate their current, if there is any current.
If the LEDs are 3.6V white or blue ones then their max current is ZERO.
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