Let's see if they congregate around certain ideas.

All is invited to congregate in 10 minutes,

What happens when 20,000 people congregate in a camp?

And it was said to the people, Will you congregate

Before Mom's family had a piano in Cape Breton, she learned to play the rhythms on a piece of board, and the fiddlers would all congregate to play on the cold winter's evenings and Mom would be banging on this board, so when they bought a piano, they bought it in Toronto and had it taken by train and brought in on a horse, a horse and sleigh to the house.