But in this case, the OP already has the incoming-producing asset and the expense (home show tix) is related to that (regardless of whether they buy improvements for it at the show). This is a different case to research to buy an income-producing asset (e.g. travel to inspect IP to buy), because you do not have the income-producing asset at the time the expense was incurred.
It's the same with other incoming-producing assets. For example, a share-picking newsletter is not deductible if you do no already own shares (i.e. it is research to possibly buy an income-producing asset) but may be if you already have shares (i.e. it is research to manage your income-producing portfolio).
Also, educational expenses related to your current work are deductible (as they relate to current assessable income), but educational expenses to change into a different field unrelated to your current income-producing job are not deductible (as they relate to possible future income).