Great question — answering as the UphillTech team:
As far as my experience goes, you can expect to see Happy Hour-style discounts on workdays during business time (e.g. on Tuesday, Wednesday and Thursday, 3PM to 6PM there would be different kinds of Happy Hour discounts on various kinds of drinks). The rationale here, venues are completely empty after lunches has ended but before evening began. So they hope to capture at least some stray traffic. This is rarely seen in the evenings because that's the time you can charge the full price, go into black. Still there can be some seasonal/weekday offerings on a narrow set of inventory. This will apply to the part of Eastern Europe that's ex-USSR.
Full answer by alamar: https://travel.stackexchange.com/a/121156 (CC BY-SA 4.0).
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