It is believed that Bitcoin halving is an event that happens every four years
It does happen every four years or better still, every 210,000 blocks.
Since Miners rewards is being cut half during the halving, do they still continue in the number they were before the halving?
It's expected that some will drop off after the halving, but it balances out after sometime as new miners come in. Bitcoin hasrate dropped slightly after the halving.