90th Birthday Celebration for my Polish grandmother - any ideas?

I am throwing a 90th birthday party for my grandmother, my Busha and I am wondering if anyone has any ideas for decorations, theme, food, traditions??

Since the traditional Polish happy birthday song is stolat which expresses the wish that the person whose birthday it is lives to be one-hundred years old, and your Busia only has ten years to go until she becomes a centenarian, and the Roman numeral for ten is "X", and "X" is slang for MDMA, you should have a rave with lots of pills and trippy house music.

Where does your grandmother live ?

set up a playlist on youtube of all her old favorites. You can find traditional songs, religious, partyzanckie, classical... I had some elderly relatives visiting recently, and they were blown away by the accessibility to the music of their youth. They were either signing, dancing or crying.

i'd be careful if i were you. you don't want to overwhelm babcia with too many suprises.