controller.rb

def create
  @room = Room.find(params[:room_id])
  @event = @room.events.create(event_params)
  @event.create_recurring_events
end

event.rb

class Event
  attribute :recurring, :boolean

  def create_recurring_events
    return unless recurring?
    
    schedule.occurrences(end_time).each do |time|
      # use the current event's attributes to populate the new one, 
      # but override the start time with the one from the schedule
      room.events.create(attributes.merge(start_time: time))
    end
  end
  
  def schedule
    # your ice_cube schedule
  end
end