HI!
2 questions!
1) Should I invest my money in crypto NOW or should I wait till 1 aug or till i dips again (if) ?
2) Can I keep altcoins (no bitcoin) on Bittrex during the 1 aug fever ?
1. I think that now, well, it might be the best time to invest. But it's all up to you. The price keep going up and up. But it doesn't mean there won't be any fall. You should know the risk.
2. Yes, you can. segwit, fork and all didn't affected altcoin price.