Didcot's refurbished Red Cross charity shop will be relaunched on July 17 with a one-day sale.
The shop in lower Broadway was closed for 18 months because of drainage problems.
The enforced closure allowed the premises, which officially reopened in January to be refurbished and extended.
But manager Lynn Head said: "Because we are located in a quiet part of the town centre and we were closed for so long, many people are still unaware we have reopened."
The shop will be decorated with balloons for the 10 per cent-off sale and there will be free nibbles and drinks for customers.
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