i think that sounds great!
The Fifties brought us many great things...
Poodle skirts and petticoats,
Elvis Presley and Cherry Coke,
But best of all, Margaret (last name)!
So come, dance, have a good laugh!
Let's see your 50's best
put your saddle shoes to the test
as we celebrate Margaret's 60 years
and knock back some beers (LOL) or---
with that famous (lastname) cheer! (if it'll be a family party)
It's a surprise, so please do not tell!
The look on her face will be super swell!
That's kinda long though, haha