pulled out all the stops

Went "all out", or tried as hard as possible to please or impress.

To spare no expense.

to do everything you can to make something successful
most likely source:

The stops are handles on an organ (= a large instrument used in churches), which you pull out when you want to play as loudly as possible.

They pulled out all the stops for their anniversary party.
The hotel certainly pulled out all the stops to impress us.
Beyonce really pulled out all the stops with her show last night!