I know you said you cannot post due to liability, but even posting a small sample, say 20 rows, with non-identifiable data would be beneficial and likely lead to a much faster response.
Edit: So you want the sum of the dollar amount in Column B corresponding to each unique event number? A non-programmatic approach would be as follows.
1. Highlight the entire range of Event No.'s in Column A.
2. From the Data tab, Sort & Filter Group, Click Advanced.
3. Enable Copy To Another Location; Specify a location where you would like these to go (I chose G1). Click Ok.
4. Now offset one column to the right of this new, unique range, utilize the SUMIF function.
5. Assuming Column G has my unique event no's, Column A has the total range of Event No.'s spanning 20 rows, and Column B has the dollar amounts also spanning 20 rows:
6. Copy and paste down for the entirety of your unique event no. range.
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