As a heads-up, Bungie is raising money for two separate events:

• The Gauntlet board game tournament, where Bungie faces off against a bunch of other game studios such as Valve, PopCap, Harebrained Schemes, Microsoft, etc. The money from this event supports YouthCare – a charity that supports homeless young adults.
  
• The "Men in Kilts" competition where employees of local businesses dress up in kilts to support Ronald McDonald House.

To help sweeten the pot, Bungie is offering some rewards for donating:

• $50 – Winding Path in-game Emblem for Destiny.
  
• $100 – The reward above, plus a drawing of you of questionable quality by a Bungie non-artist (sometimes known as “Programmer Art”).
  
• $250 – All rewards above, plus play Destiny with one of Bungie’s devs.
  
• $500 – All rewards above, plus a digital caricature drawn by an actual Destiny Artist. (You can compare and contrast your programmer art with this version).

The steps to get the rewards are as follows:
1. Choose a charity to donate to. The Gauntlet or Men in Kilts.
2. Donate at one of the levels listed above.
3. Be sure to provide a valid email address when filling out the donation form.
4. Wait until after the events end (around 5/15) and you will be contacted via the email address provided to collect your rewards.

More information is available here.

Additional:
Bungie has also donated a bunch of items (Ghost edition of Destiny, a studio tour, master chief statues, etc.) to an auction for the family of game dev Michael Forgey.
The auction is here.
More info is here.