Rajesh Nair’s “The Tiger’s Nest,” courtesy of the Octagon Museum DCist’s guide to lectures and discussions in the D.C. area This week, early planners rejoice, because we start including next Monday’s events into this week’s TTMB. Also, those regularly interested in some of the more expensive events at the S. Dillon Ripley Center (and other Smithsonian Associates events) should note that the prices listed below are for general admission. If you want double digit…