Assuming that music in copyright was used then in this scenario the event would need to be split between a free event and a ticketed event. The members and any other individual who did not pay to attend would fall under the non-ticketed tariff. Whereas non-members who did pay to attend would fall under the ticketed tariff.
As an example, if you had 40 members where attendance was included as part of their membership, and 30 non-members who paid to attend, then the 40 members would fall under the non-ticketed rate and the fee owed for this part of the event should be calculated based on having 40 people in the audience. The 30 non-members would fall under the ticketed tariff and the amount due would be based on the percentage of gross ticket income from those 30 non-members (either 6.5% or 3.25% dependent on whether the group is classed as amateur or not as per the PRS definition).
