Hi Bill! Congratulations on your upcoming anniversary! I think a visit to Walt Disney World will be a wonderful and memorable way for you and your wife to enjoy such a great milestone!
My best recommendation for time of year to visit would be September. That month tends to have lower crowd levels, since kids are back in school, the weather is usually terrific with only minimal rain and warm but not stifling temps, and that generally is the best bet as to when they "might" offer a free dining promotion. Of course, there is no guarantee to any of those, but if it were me going, that's the month that I would pick - September is my all-time favourite time to visit Walt Disney World!
There are always a variety of events taking place at the America Garden Theatre at Epcot. There are the Flower Power Concerts during the Flower and Garden Festival in May, the Sounds Like Summer Concert Series throughout the summer, Eat To the Beat Concerts during the Food & Wine Festival in late September and October, and the Candlelight Processionals held in late November and December. There can also be other various musical events taking place at different times of the year.
Bill, for all the latest announcements on events and Disney related news, I recommend visiting the
Disney Parks Blog and subscribing to their daily email. That way, you will be one of the first to know all of the upcoming news for Walt Disney World, and it may make it easier to plan your vacation around one of these special events.
Please let me know if there's any other questions I can answer for you while you are planning your Anniversary vacation at Walt Disney World. I would love to help you!
Kristen