。
Bring your friends along.
Literal
Friends [object-を] bring-[soft-imperative-てきなさい].
連れてくる ('to bring [a person]') combines 連れる ('to accompany, take along') with ~てくる. The soft-imperative なさい makes it a gentle command. Used when inviting someone to bring their friends to a gathering — common in casual polite invitations.