<% cal = Icalendar::Calendar.new @events.each do |event| next unless event&.slot&.starts_at cal.event do |ical_event| ical_event.dtstart = event.slot.starts_at ical_event.dtend = event.slot.ends_at ical_event.summary = event.title ical_event.description = event.description ical_event.created = event.created_at ical_event.last_modified = event.updated_at ical_event.location = event.slot.hall.name ical_event.url = "https://www.openfest.org/2019/bg/full-schedule-bg/#lecture-#{event.id}" ical_event.alarm do |alarm| alarm.summary = event.title alarm.trigger = "-PT15M" end end end cal.publish -%> <%= raw cal.to_ical %>