The US Government is currently funded until 17th November. If there is no agreement to fund the government past that date, it is likely that there will be a government shutdown.

The market currently thinks that there is around a 40% chance of a shutdown - 

Legislation to fund the government needs to be passed by the House and the Senate and signed off by the President.

On which date will the necessary legislation be passed to fund the government, either to avert a shutdown or to end a shutdown?

If a shutdown starts and it looks like it's going to last a while, I will add more dates. If you have bet on "Other", you will automatically receive shares in these newly added dates!