Stanley Pearson will “treasure forever” his memories of the garden party at Buckingham Palace.
The volunteer helper was nominated for the honour by Rutland Dyslexia for his “tireless” work for the organisation.
Most of those attending the event on June 3 recalled getting drenched by heavy rain.
“But we did not get wet at all - I timed it just right for the tea tent,” said Mr Pearson, a former Royal Engineer who lives in Melton Mowbray.
“The heavens opened at exactly 4pm when the Queen made her grand appearance. After a quarter of an hour the sun came out and all was well.”
Mr Pearson, 63, who went to the garden party with his wife Ann, 60, said being dyslexic held him back, so he wanted to help others because he learned that the condition “can be improved by developing your own strategies”.
Anne Sudborough, secretary of Rutland Dyslexia Association, said: “Stan worked tirelessly for Rutland Dyslexia for 12 years. He attended numerous committee meetings, supported Rutland Dyslexia’s fundraising events and work-shops on dyslexia.
“He was a great mainstay at the five Rutland Dyslexia Roadshows and was front-of-house welcoming all visitors come rain or shine. Ann was always ready to come along to the roadshows to help out.”
Mrs Sudborough said the nomination for Mr Pearson to attend the garden party “acknowledged his contributions to our county as a core member of Rutland Dyslexia”.
Chairman of the Leicester Dyslexia Association Chris Hossack said: “He was brilliant at fundraising, beating down all doors. He ran workshops for the dyslexic community at local Melton schools and was a Befriender for 15 years for anyone with dyslexia.”
In December, Mr Pearson, who retired from volunteering because of family commitments, received the British Dyslexia Association’s Lifetime of Outstanding Contribution certificate.