Sorry, I couldn't find pricing data for that day. The closing price for Bitcoin (BTC) in terms of EUR on June 6, 2019 was 6,904.43. It was down 0.4% for the day. The latest price is 80,668.07.
The 5th halving event is expected to occur on April 20, 2028 once 1.05M blocks have been mined. The block reward will decrease from 3.125 to 1.5625 coins per block.