Also Holy Week (Semana Santa), hundreds of pointy-hat parades, singing. The date depends on Easter, of course.
Russia: St Petersburg. Music Spring, International classical music festival.
Best European cities April, sightseeing in good weather
Spain: with the exception of the far north, Spain is generally warm and pleasant in April. Visit the magical Moorish cities of Seville (esp. for Feria de Abril 7 day party at the end of April), Cordoba and Granada, where the days are warm and the nights coolish, as well as Malaga and Cadiz – cities that don’t depend on moody brown beaches for tourism.
Barcelona too is a lively, interesting city spiced up by wacky Gaudi architecture though it can be a little chilly in April. Swimming in the Mediterranean in winter is not on yet, nor is the sad, overbuilt Spanish coastline that is now dedicated to sun, sea and sangria package people.
France: The Côte d’Azur should be warm and sunny in April. Cannes, Nice, Menton, Monaco, St. Tropez – and the little villages such as Eze, St Paul de Vence – are all attractive and interesting if you work at it.
The Mediterranean is not swimmable by normal folk though some hardy souls enjoy it.
There may still be some skiing possible nearby but snow quality will be declining.
North France will be a bit chilly and the Mistral wind will still be tormenting Provence tourists.
Greece: April is fine for Athens and the south; it’s getting warm and crowds are acceptable. Greece is loaded with sights, ruins and landscapes (e. g. Meteora). The islands are gorgeous, though the north is chilly, the Med’s still too cold for swimming and most of the ferry systems are inactive. . . so fly!
South England – nearly not in the EC now due to Brexit – could be warm and sunny. Equally it could be cold and wet. Whatever, London always makes a great visit even if accommodation is pricey, the superb free museums and galleries make up for it. Stonehenge is not far, nor is Canterbury, Oxford or Cambridge.