Veux-tu dîner avec moi - not sure why it is not accepted
dîner = have dinner
Here, it can be any food (lunch, or even snacks)
I got only dîner from my word list (I got the word arranging exercise), and dîner in verb form should mean to dine. The suggested answer was "Veux-tu aller dîner avec moi." I am not getting why I must add aller.