In 1975, Dennis Ryan opened the doors to Denny’s Pub on Beverly Road, transforming what was once a small beauty parlor into a neighborhood mainstay. Fifty years later, his son, Kevin Ryan, is keeping that legacy alive — and this weekend, he’s celebrating the bar’s golden anniversary with live music, giveaways and drink specials that throw it back to the prices of the 1970s.

“It’s a family business,” Ryan told Brooklyn Paper. “My father started it in 1975 and built it from scratch. Before that, he had owned a bar in Park Slope for 10 years. He was a barman.”

When Ryan’s father moved to Kensington , he made sure to buy the property outright — a decision that helped Denny’s ensure when other local spots came and went. Back then, the bar was a full-service restaurant known for st

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