With the JWs the line between religion and social contact is very blurred. But that's on them too.
For example, in the Candace Conti case WT was found vicariously liable in the supervision of the child during church sponsored activity (in the field ministry) and although the alleged violation occurred outside the activity, the Court ruled that Candace was supposed to be in Field Service at the time and WT appointees failed to supervise her. And decided that WT was liable because WT governs field service according to the ruling. the The rule here is church sponsored activity. Perhaps it may be argued that a JW “gathering” or party may also be deemed as church sponsored if elders are present.