halving #4 day

app/coins/btcHolidays.js

@@ -155,6 +155,11 @@ module.exports = {
 			name: "First Transaction Day",
 			date: "2009-01-12",
 			desc: "On this day in 2009, Satoshi transferred BTC via <a href='./tx/f4184fc596403b9d638783cf57adfe4c75c605f6356fbc91338530e9831e9e16'>the first ever (non-coinbase) transaction</a>. The recipient of that historic transaction is none other than Hal Finney."
+		},
+		{
+			name: "Halving #4 Day",
+			date: "2024-04-20",
+			desc: "On this day in 2024, just after midnight UTC, the fourth \"Halving\" cut the subsidy from 6.25 BTC to 3.125 BTC."
 		}
 	]
 };