Answer:
This is a good idea because Larry will be able to benefit from a higher tax deduction this year.
If Larry anticipates his charitable contribution, he will be able to lower his current tax liability by $3,000 x 24% = $720
Next year, Larry will probably choose the standard deduction of $12,400 since his other itemized deductions are not as high as this year's. Since he will choose the standard deduction next year, Larry will not benefit from the charitable contribution. If he does not make the contribution this year, he will actually lose the $720 deduction.