Effective Altruism Global London 2024 happened at the end of May / start of June. It is free for all participants, however, they highly encourage donations as part of the entrance process, but they do not claim Gift Aid on this.

I am interested in knowing what value was left on the table, to help judge if it is worth the EAG team putting effort into this for future events.

For this question, assume the following:

• Only estimating the value of the Gift Aid claimed by EAG, and ignoring the potential value higher earners can get by declaring the donation on a tax return.

• Assume for simplicity that people's donation amounts were not affected by whether the donation was tax deductible or not.

This answer will be resolved if the EAG team make a public estimate of the value they could have gotten.

If the EAG team does not make a public estimate, then I am not sure of the best way of resolving this. I assume it is up to my discretion based on the most convincing estimates. This is the first question I am posting on a prediction market so any help/advice will be appreciated.