A versatile methodology to obtain efficient catalytic materials suitable for selective, liquid-phase oxidations of alcohols is described. Charge stored in the parasitic capacitances of the signal lines is thereby recycled from one signal line to another, reducing the current consumption of the driving circuit. At least one electronic communication transmission from an attendee who has access to the central communication point is enabled to have at least part of the transmission broadcast at the venue or allow open communication from the attendee to be broadcast at the venue.