Yes! You can now reserve your desired slot up to a week in advance.
But just like when taking a flight, you still need to "check in" on the night, at least 10 mins before the music starts.
And if you can't make it, we do ask that you let us know by cancelling your reservation (so others can take your slot).
To reserve your slot head to http://ukopenmic.com/venues (where you can also see the "walk-in" sign-up times for each night; the music normally starts 30 mins after sign up).