expression
those who want it; those interested
Polite, somewhat formal phrase used to refer to people who desire or request something, often in announcements or offers. The 向き here means 'person' or 'those who are inclined to'. Typically followed by a verb phrase indicating what action they should take.
ご希望の向きは、お早めにお申し込みください。
Those who are interested, please apply early.
ご希望の向きは、受付までお越しください。
Those who wish to participate, please come to the reception desk.
希望者 is a more direct and common noun meaning 'applicant' or 'person who desires something'. ご希望の向きは is a set phrase with a more formal, polite tone, often used in announcements.
A polite set phrase combining the honorific prefix ご, the noun 希望 (hope/request), the noun 向き (direction/person), and the topic marker は. The use of 向き to mean 'person' is a formal, somewhat literary usage.