Employee members of the IBM Club are covered by the global IBM [public liability] policy, both when acting as event organisers and when attending events, with cover up to a maximum of $5m.
Retiree, Dependant and family members of all Clubs (except Hursley Local Club) are covered by a separate public liability insurance policy, both when acting as event organisers and when attending events, with cover up to a maximum of £5m. See here for the Summary of Cover and here for the Key Facts including important exclusions and how to make a claim. If you need to provide evidence of cover then this certificate should suffice.
In the event of an incident, the affected Club is responsible for handling and reporting the incident to the relevant policy provider. The IBM Club Oversight Manager should also be notified.
Note that neither policy provides cover for personal accidental loss or damage to your own property, the only optional cover included is for Employers Liability. It does not remove the need for individuals to understand and act on their own personal insurance needs.