Perhaps aimed as much at the 50s crowd as a mod crowd, but if you like your R&B, you might want to check out Barefootin' in Sheffield.
It's a new monthly night playing Rhythm & Blues with a side helping of Jump Jive and Rock 'n' Roll, all from original vinyl of course. The first date is Thursday 6th May 2010 at The Harley Hotel, Glossop Road, Sheffield (just on the edge of the city centre), then the 1st Thursday of every month thereafter.
Free entry, it runs from 9pm til late (somewhere between 1am and 3am) with tunes from regular DJs Cherryred & El Jackster with special guest DJs for future events. Email here for more details.