With many couples not making it to their 25th, 50 is a milestone for sure...you will have a wonderful time with your family.
My parents did not make it to their 34th. For MrOK's parents we held a surprise party, under the guise of taking them out to dinner...extended family and close friends in attendance...In a month's time we had their 50th which I did most of the organizing for as SIL lived 6 hours away, hosted a HS graduation reception, and we finished work on the parlor and put cows through it for the first time....plus regular spring field work...ah to be 20 years younger. Oh and I was a full time student. For their 55th we had cake in a park after a college graduation...much easier although it rained that day.