Happy birthday to us! Hard Rock officially turns 40 on June 14, 2011, and we're celebrating by giving stuff away.

Okay, so we have this little event in London coming up in a couple weeks. It's called Hard Rock Calling and, yes, it is going to be awesome. If you don't have tickets yet or are on the fence about going or don't want to shell out cash for them, we've got a way for you to possibly get your hands on some tickets.

From June 20-23, our Hard Rock team will be stationed at different spots around London, handing out Hard Rock Calling tickets, money-can’t-buy backstage tours, Absolute Radio digital radios, Vodafone gear, Hard Rock t-shirts, and more.

• Where will the Hard Rock team be and how can you find them? All you have to do is follow us on Twitter and Foursquare. On Twitter, we'll be dropping hints and clues about our locations and who to look for. On Foursquare, we'll be checking in to each of the locations. You'll have to be on top of your game if you want to find us.

• What happens when you find us? The first person to find us at each location and say "I follow Hard Rock" could win tickets to Hard Rock Calling!*

• What if the Hard Rock Calling tickets have already been given away? We'll still be giving out other stuff, including digital radios, Vodafone gear, Hard Rock t-shirts, and other Hard Rock awesomeness. So, even if you don't win tickets, you can still walk away with free stuff!

Good luck! Click here for contest terms and conditions.

*Each winner will be selected by a Hard Rock representative at the venue.  Odds of winning depend on number of entrants following Hard Rock’s publications of where its representative will be located in London, United Kingdom. The prizes are as stated and no cash alternative will be offered. Hard Rock reserves the right to award additional or alternative discretionary prizes. Hard Rock Calling tickets may be for any one (1) of the festival days.