Mid-week partying is most definitely encouraged (by us) in the run-up to Christmas, so forget going to work early on Thursday and head to Brixton's Jamm for a night of reggae, jazz, ska and dubstep. Lunatrix, CODA and ChainSka Brassika will be leading the fun, and it's all in the name of a good cause, with all profits going to Voluntary Services Overseas – another good reason to go Wednesday raving.