Conmemoremos / festejemos a aquéllos que vivían / vivieron...
no
It means they want to celebrate it AFTER your actual birthday.
nomas
Vamos a tener.
Vamos a trabajar.
there is not an exact translation for it; it depends on what you want to say. ex: lets go eat - vamos a comer lets jump- saltemos ( as you can see in this case there is no word used instead of lets, but it is understood as lets jump)
DivirtámonosPasémonosla / pasémonoslo bien
Divirtámonos vamos a divertirnos
Vamos a jugar!
Vamos a divertirnos
'Lets go' in Spanish
Vamos a la tienda