Here are a few events and links to web pages that i have found that are happening around England in the coming months:
Richard Hamilton was a pioneer of the pop art genre and one of the most influential artists of the last century. His work is being showcased at the Tate Modern from Thursday 13th February until Monday 26th may http://www.tate.org.uk/whats-on/tate-modern/exhibition/richard-hamilton
Dick Bruna is most well known for creating the much loved children's book character Miffy. as it is coming up to his 60th anniversary since the first publication of 'The apple' the Foyles book shop is hosting an exhibition showing Dick Bruna's work on tuesday 6th August 2013 http://www.foyles.co.uk/Dick-Bruna-Exhibition
Here are a few examples of galleries that are really well known especially for exhibiting illustrations
Illustrative festival Berlin
This festival is a bi annual festival celebrating and showing art and illustration from all around the world. This festival is not set in stone to be held at a specific time of the year and some years it is not ran at all so with things like this you have to keep up to date with what is going on and where you can exhibit your work. Festivals are great for showing your work to lost of people in a small amount of time. This festival is also particularly good for young illustrators as every year they have a young illustrators award.Find their website here
House of Illustration
This company is great for illustrators in particular as they curate touring exhibitions, run international competitions and put on events with some of the worlds leading illustrators. They are also working towards opening up their own public gallery and education space especially for illustration.
Find their website here
The illustration cupboard
This is a great place for illustrators to showcase their work as this gallery is well known throughout the illustration industry. The illustration cupboard is a central London gallery that shows some of the best contemporary illustrations from around the world. This gallery is mainly focussed on children's books.
Find their website Here