In June I have 8 ES contracts to rollover. I may not be near a computer at rollover day due to my son's graduation, so I have another plan. Please tell me if this is a stupid idea and why. I put in an order to buy the September contracts before the rollover date (ie now) under the current bid. If it hits, I sell the June contracts at market immediately after. Is this stupid and if so, why? Thank you.