Are you looking for a checking activity before a diagnostic or progress test about grammar? If your answer is yes, you have just found the right post for you!
What's an auction? It's a public sale of goods or property where people make higher and higher bids (offers of money) for each thing, until the thing is sold to the person who will pay most.
What's a Grammar Auction? It's a fun game which will let teachers understand which topics students have assimilated well and which aspects students need to repeat. This game is perfect for pre-teens and teens but it is also suitable for adults (as a teacher who borrowed the idea told me). It usually lasts 1 hour.