From a management point of view, I think this is a questionable practice. I suggest that you give reviews at the office, and independent of that, maybe to celebrate the review, you have lunch together. If you make the lunch completely voluntary, you do not have to pay for the time. With my hourly employees, I occasionally have taken them to lunch, told them it was voluntary, and then waited to see what they put on their time cards. I paid the ones that asked for it.
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