Well a coupla things here. First, the word "cocktail" give me the eebiejeebies. I'm fine with "aperitif." That can be a sherry, a glass of dry white or cava or Prosecco, or one of those with something to perk it up a bit. Champagne simply isn't worth your hard-earned dough. Prosecco with ice and a dash of limoncello is a thing of beauty, as is the aforementioned Aperol spritz, for example. Second, the tapas idea is very sound. As a matter of fact, last night, in the heat, we had my home-made salmorejo with the Aperol spritz. It's a classic tapa, originating from AndalucĂa, that knocks gazpacho into a cocked hat. I can't remember whether I've ever posted my recipe before, but I've spent years perfecting it, and my folks and friends all rave about it (on hot summer nights...). It's so simple to make and you can make it at least a couple of days in advance. All your friends will love you. I'll post it afresh on that recipes thread...
Sadly, Monday is a non-drinking day, so I suppose I'll have to try that Budvar that Dave recommended...