The Deputy Children's Commissioner Sue Berelowitz has countered criticism of her report on child sexual exploitation describing it as "calm" and "measured".
She also said there was a risk of too much attention being given to high-profile cases involving Pakistani men.
She said this was just one of many models of exploitation and that data on the ethnicity of perpetrators only exists in six out of 10 cases.
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More than 1,500 people are expected to attend the multi-faith service, including many bereaved families and survivors.
The app enables people in Devon and Cornwall to view current waiting times for local emergency departments and minor injuries units.
Hayek said Weinstein would turn up at her hotel room asking her to take a shower with him or let him perform a sex act on her.