Possible Clues:

• Day of very hot and sunny weather
• Super hot day
• Composer found outside church during very hot period
• Twenty outside church by river, it’s a very hot day
• Composer has caught cold on hot, hot day
• A remarkable thing to see composer accepting honour
• Extremely hot day finds recorder in church? On the contrary!
• It's almost 20, dear, in Paris -- not a day for an overcoat!
• One ironing negligently? It’s a hot day!
• Excellent example as writer of music embraces church