Tap "n" Tumbler on Talbot street like last year ?
We are quite spoilt for "alternative" pubs in Nottingham, but the Tap has always been a pre-Rock City pub, even for a basic Saturday night at Rockers. Mainly due to its proximity to Rock City, just a minutes walk away., and plenty big enough.
Otherwise, there is also The Old Angel, and The Salutation, both alternative pubs, to name a couple more, and also venues with there large upstairs, but both quite a trek to Rockers.
For anyone wanting to have a bit of a wonder, again can I please recommend, Forman's Punk Rock Bar. Its 3-4 mins walk from the Tap, on a pedestrianized street off the Corner House cinema complex. Well worth a visit for a quick pint. The staff when they see NMA tops will stick an appropriate song on. It is in an area of eateries, but more to the point if your peckish before the gig, it is next door to a decent traditional English fish and chip shop.
Here is a nice review on Louder Than War --
http://louderthanwar.com/how-to-survive-as-a-small-venue-foremans-punk-bar-in-nottingham-shows-the-way/If anyone wants to go, I will be glad to meet up, then onto the Tap.
If you like historic pubs, there is the Old Trip to Jerusalem about 10 mins walk from Rockers. Nearby, the Salutation which is Nottingham's rock pub.
The Salutation historic for its part in the English Civil War. After King Charles raised his standard at Nottingham Castle which started the war, the Salutation was instantly set up as Loyalist recruitment station. After three weeks it had only recruited around 300 volunteers, so the King left for Shrewsbury where support was stronger.