On August 1st, they will implement the Segwit and there are some uncertainties involved. If I were wanting to invest, should I do it before or after the date?
My concern is that the price would still be higher than the price on August 2nd if the implementation did not go as smooth as planned and caused the price to drop.
Also, what is the official words on the implementation?
It really depends just on what you want to do, there's nothing that really guarantees how well the fork will go and, while it will likely go smoothly due to the amount of testing they'll be doing (and probably are doing right now) prior to the actual implementation of it. But you're right, things can go wrong or people might sell due to uncertainty. If anything, I would wait for the presumed dip soon before it happens and then buy. But it's your money and I'm not going to tell you what to do.