Can I invite some friends for an evening?
in-vi-TA-re — four syllables, stress on the third.
Always ask the host before having guests over. Most Airbnb house rules address this — some hosts allow it, others prohibit it.
'Posso invitare' (can I invite) + 'degli amici' (some friends). 'Degli' is the partitive article (some) before masculine plural nouns starting with a consonant. 'Per una sera' = for one evening. This is a polite way to ask permission rather than just bringing people over.
Posso organizzare una cena con amici?
Can I organise a dinner with friends?
More specific — a sit-down dinner is less disruptive than a party
Quante persone posso portare?
How many people can I bring?
Ask for a specific limit to know the parameters
Ho capito che niente feste. Ma una cena tranquilla va bene?
I understand no parties. But a quiet dinner is okay?
Show you have read the rules and are asking within reasonable limits
Italian neighbours in apartment buildings ('condomini') can be very sensitive to noise from Airbnb guests. Italian condominiums typically have regulations prohibiting noise after 10–11pm. Your host is legally liable for disturbances caused by their guests, so they have every right to set limits.