Today in D.C.: Four things to watch for

The 90th annual lighting of the National Christmas Tree is tonight.

Silver Line: Metro is expected to release a report on changes to the Silver Line, including a decision to extend the rail line.

Gay marriage: Gay couples planning to wed Jan. 1 will be able to get post-dated marriage licenses today in some Maryland counties, officials said.

Weekend plans: The Going Out Gurus will discuss concerts, happy hours, weekend getaways and other weekend plans in a live chat at 1 p.m.

 
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