You said you would organise the reveal, and suddenly the scan appointment, the guest list, and the cake are your problem. There is no dedicated reveal product to reach for โ the honest path is to build on the baby shower setup, the closest supported event type, and shape it around the moment.
A hosted page is worth it for a reveal because so much hangs on timing and secrecy. The invitation must reach the right people, the dress colours must be read correctly, and the headcount for catering needs to be real before the caterer calls. Building it in one sitting, then letting replies gather themselves, is what keeps a friend-hosted reveal from becoming a second job.