The Capital Weather Gang predicts sunshine and blue skies will rule the weekend, which is great news for the plethora of outdoor events on our agenda: A block party with music and dancing celebrating Arena Stage’s annual Community Day; the Washington National Opera’s Opera in the Outfield, which allows fans to spread a blanket in the Nationals Park grass to watch “Porgy and Bess”; the opening weekend of the ever-popular Maryland Renaissance Festival, with free admission for most children; a Caribbean festival on Union Market’s rooftop space, with live music, dancers, and traditional food and rum; and the return of the Fort Dupont Summer Concert Series, which has a ’90s R&B theme. Elsewhere, you can head to Frederick for Summers Farm’s annual flower festival, make reservations for Alexandri

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