If you happen to be on the other side of the Atlantic, ideally in the Chicago area, you might want to check out the Mod Chicago 9 weekender.
It takes place over 10th and 11th June, described as 'A Case Study In Mod, Soul, Garage, Freakbeat and Psych'. So R&B purists might not necessarily want to apply.
See the listing on the site for more details, plus details of how to download a free album of tunes you might hear over the weekend.
Mod Chicago 9 weekender at Modculture