Three groups from Australia and USA have launched a call for the Solstice (the start of the Festival Week) to be observed globally with a Silent Minute at 9 pm GMT preceded by the ringing of bells.
There has been a great deal of interest and momentum is building towards a global observation of the Silent Minute to be observed at the same time: 9 pm GMT, calibrated to local time zones.
More at https://sydneygoodwill.org.au/1-introduction-to-the-solstice-silent-minute/