前回書いたので4コマでは説明してませんが、3コマ目でみんなが持ってるのは「タートヴァン」というワイン試飲用のお皿です。
これを買えば試飲し放題です。
当日のみですが！

Since I wrote it last time, I didn't explain in the strip, but the things everyone in panel 3 is holding are wine-tasting saucers known as "tastevin". If you buy one, you can sample all the wine you like. Only for that day, though!