You still should don sackcloth on that yom ha’atzmut. You “Kofui Tov” ungrateful fellow Joseph:- We must extol the wonderful Nissim the Ribbono She Olom blessed us with the Medinas Yisroel, welcoming all Jews with open arms. Instead of sackcloth, I shall be donning my blue suit & white shirt and matching Israeli flag cufflinks & necktie, and be reciting Hallel bSimcho Rabbo.
I shall hold off with my sackcloth until Sunday Ov 10th, unless Moschich IY’H shows up prior to then.
Meanwhile we shall be making Eruv Tavshilin on Nisson 20th, 4 out of 5 years running, even in Israel.