This weekend, the DCist Food and Drink squad took in the 7th Annual Washington, D.C. International Wine & Food Festival at the Omni Shoreham in Woodley Park. Wine tastings, cooking demonstrations, and food giveaways spanned three ballrooms — a fitting size for a popular event that had, in previous years, occupied the main convention hall at the new Convention Center. The change in venue didn’t amount to a change in tenor. Perhaps because wine-tasting evokes…