"Additional guests" refers to people, other than the expected or original number, who are included or invited to an event, gathering, or occasion. Full definition
Located on the top floor with an elevator, it is a one - bedroom apartment with a sofa bed in the living room for additional guests if required. (wandertooth.com)
There are two additional guest bedrooms with two twin beds, and a third bathroom. (villascostarica.com)
Additional guest bathroom, living / dining area with flat screen TV, AV system and complimentary WiFi. (bespokehotels.com)