Vaccine by October? 30 Million doses? You wont be getting a vaccine, if ever, until earliest around  autumn 2021, taking into account both testing and production. If that is what you are relying on, such events are still pretty shaky for next year as well. We're only in the early foothills of this, with no guarantee we'll be able to climb the mountain. Current planning projecting measures until 2022 and even they are open ended.