Keswick's Theatre by the Lake has unveiled plans for a £700,000 extension.
It wants to build a cafe with views over the nearby fells.
The theatre's managers say it would be the biggest development since it opened in 1999.
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The family of Christian Pay, who died on Friday after suspected substance abuse at a festival, have paid tribute to the Millom teenager.
The Borders Railway is to be officially opened by the Queen... on the day she becomes Britain's longest serving monarch.
Christian Pay's family say he was "loved by all" and had "the heart of a lion". The 18-year-old died after falling ill at the festival.