The summer-fair spreadsheet, minus the spreadsheet: every stall's costs, price-per-go, expected sales and cash float in one table, with projected profit updating as the committee changes its mind. Starts with a typical fair you can edit. Saved in your browser, exportable to CSV — no signup, nothing uploaded.
"Expected gos" = your honest guess at how many times the stall sells (last year's fair is the best guide — the committee's optimism is not). Float is the change each stall starts with; it comes back at the end of the day, so it's cash to organise, not cost. Everything saves automatically in this browser.