Right now, according to the official schedule on disneyworld.com, there are no Spectromagic runnings scheduled for May. There has been some speculation as to why that is (eg. moving to another park, cuttbacks, rehab, etc)...but is still at MK, running through April as far as we know.
You can call at 407-W-DISNEY but the answer you will probably get is that the schedule is not yet established for September. May hours were just released.