The people saw that Moses took a long time to come down from the mountain. So they gathered around Aaron. They said to him, "Come. Make us a god that will lead us. This fellow Moses brought us up out of Egypt. But we don't know what has happened to him."
References for Exodus 32:1
Aaron answered them, "Take the gold earrings off your wives, your sons and your daughters. Bring the earrings to me."
So all of the people took off their earrings. They brought them to Aaron.
He took what they gave him and made it into a metal statue of a god. It looked like a calf. He shaped it with a tool. Then the people said, "Israel, here is your god who brought you up out of Egypt."
When Aaron saw it, he built an altar in front of the calf. He said, "Tomorrow will be a feast day in the LORD's honor."
So the next day the people got up early. They sacrificed burnt offerings and brought friendship offerings. They sat down to eat and drink. Then they got up to dance wildly in front of their god.