Time travelers! Don’t be late for the 100th Annual Portland Time Convention, sponsored by the University of Southern Maine’s Planetarium in Portland, ME. (The first annual convention will have taken place in the year 2112, according to the website.) There will be scientific lectures about space, black holes, and time, plus an evening of time travel fiction readings. Set your chronometer for June 30th, 2012. Visit http://www.usm.maine.edu/planet/100th-annual-portland-time-convention-2 for details.