This is the 758th most frequent Italian word.
venga
"Venga" is the present subjunctive form of "venire" (to come), meaning "may come" or "come" depending on context.
In this sentence, 'venga' is used as a subjunctive form of the verb 'venire' (to come) to express hope or wish.
Spero che venga domani alla festa.
I hope he/she comes to the party tomorrow.
Here, 'venga' is also a subjunctive form showing a concessive or permissive tone.
Che venga pure, non c'è problema.
Let him/her come as well, it's not a problem.
In this instance, 'venga' is used formally as an imperative form in addressing someone respectfully.