Stargazers in Northeastern Canada and United States, get ready, this is a very rare event! In what's according to Sky&Telescope is "best and brightest 'asteroid occultation' ever predicted for North America", the main-belt asteroid (163) Erigone will occult one of the brightest stars of the night sky, Regulus, or α Leonis - it may even completely "switch" it off. The event will be visible in a large stretch that includes Long Island, New Jersey, Connecticut, New York metropolitan area, upstate New York, and Ontario. The occultation is predicted to occur next wednesday night (March 19-20) at 02:05 EDT (07:05 UTC). It may last up to 14 seconds.
From my own experience, I recommend to observe even if you're not living in the path indicated by the map (which is, in fact, just a probable path, the true one may differ by several kilometers due to inaccuracies of the asteroid's position) but a few miles outside of it. In 2010, we tried to observe an occultation of another naked eye star in Europe, δ Oph, only to find out that the true shadow path passed about 10km more to the North!
I will not bother to write down more details here, and instead refer to the special website of the International Occultation Timing Association (IOTA) and the corresponding article on Sky&Telescope.com.