From the www.tourguidemike.com site i found that during your stay 17-23 May there are the following events:
Magic Kingdom Hours
17th 9am-9.30pm, Spectro at 8.45, Fantasy in the sky fireworks at 9.30
20th 9am-9.30pm, Spectro at 8.45, FITS at 9.30
Eride nights May 10, 17, 24, 27 and 30th
Hope this helps........a lot of people are over the moon about the addition of more spectro and fits's during their time at WDW!! Myself included......