Name two human rituals that the animals use to celebrate their victory over Mr. and Mrs. Jones in Animal Farm.

Unlike the above answer, I thought the question referred to the animals' celebration of their "victory" in the Battle of the Windmill.  I'm answering on that basis.

The animals fire a gun and conduct a funeral procession, complete with more firing of the gun, speeches and songs.

It is, of course, ironic that the animals celebrate with human rituals.  But what's really ironic in this episode is the fact that the animals are celebrating at all.

They say they've won a victory, but in truth, they've lost.  The windmill they worked so hard to build is gone.

So what's really important here is that this is further proof of how Napoleon bends the truth to keep control of the farm.