One would hope that any organisation for adults and children would have robust safeguarding procedures in place, and at risk of legal action if they failed in the safeguarding duties.
On the other hand it seems to me that "Pride Hubs" (drop in centres that run into the evening) are a thing, run by adults, open to young adults and children. Pride In Surrey ran and still run such a hub, and their co-founders Stephen Ireland and David Sutton are now convicted paedophiles. I would be astonished if they did not at least sometimes man the hubs in the evenings, potentially, at times, being the only adult there with only one child service user.
Actually, thinking about it, are those hubs illegal? They are mixed sex (fine) but only open to men and women who are LGB (fine) or (not fine) have the PC of GR? Surely they need to be for LGB people or those with the PC of GR - not both?