We haven't seen a convergence of Thanksgiving and Hanukkah since 1888.
The eight day Jewish festival actually starts tonight (Wednesday) at sundown, and the second candle will be lit on Turkey Day.
An article at International Business Times offers a prediction of when the next Thanksgivukkah will occur, and it's apparent that no one has the slightest clue.
The next time Thanksgivukkah will be celebrated is in 79,043 years from now, according to one estimate. Another suggests Thanksgivukkah will take place in 2070 and 2165. Others believe the convergence of the two holidays will never happen again.
So...the take away here is that if you're celebrating Hannukah and Thanksgiving this year, this will probably be the one time you'll ever do so, so have a great hybrid holiday!