To add the ESS events calendar to your own calendar, the ICAL link is available here:
https://www.google.com/calendar/ical/essgroup.ecs.soton.uk%40gmail.com/public/basic.ics
To add the ESS events calendar to your own calendar, the ICAL link is available here:
https://www.google.com/calendar/ical/essgroup.ecs.soton.uk%40gmail.com/public/basic.ics