Employ social media.
Every day in London there’s a different pop-up event, free giveaway, special offer, or PR event. Keeping up with what’s going on requires keeping your phone, tablet, or laptop tuned in.
Secret London (@secret_london) on Twitter has recommendations any time you need to know the cheapest cocktail bar in your area, where there’s a free comedy show, or if a restaurant is doing a giveaway.
London for Free posts daily updates and a weekly round-up of free events in London on their Facebook page. I’ve heard about everything from new phone apps to exhibitions and launch parties through them.