No way there will be a pump. No one know exactly what will happen in August, so they will probably sell. And it is recommended that those holding Bitcoins leave them on their own wallet, not in exchanges, so the trade volume will be tiny.
Maybe some days after the 1sts August there will be a quick recovery, if things went well in 1, August.
Fork will get us an enhanced bitcoin system. It means it will start processing more transactions for every block hence there will be no more need of paying higher transaction fees. Then why should we sell. Anyone who understand what is going to happen will never think about shorting. We must support bitcoins system in its hard times rather than looking for short term profits. I am not going to sell, instead I may buy more now.
Which fork do you refer to?
If you mean a soft fork as per UASF (BIP148), then I'm all in. But as many experts, semi experts, and wannabe experts have already said, it is set to fall flat on its face unless something really extraordinary is going to happen (e.g. Satoshi coming out of his hide-out and strongly supporting UASF). If you in fact mean a hard fork by miners, and we consider this possibility seriously, then it would be bordering on ridiculous to think that miners are really wanting SegWit with Bad Blocks since they obviously want everything to remain as it is, i.e. high prices coupled with high fees