Most schools now have virtual tours and information available on their website. 

In-person tours, where I can find information about them, appear below. 

 Open days and evenings for local selective independent schools:

 Birmingham Consortium Schools

Dates will presumably be published here once set. 

Other schools

Queen Mary's High School (Girls)

Queen Mary's Grammar School (Boys)

Alcester Grammar School

Stratford Upon Avon Grammar School for Girls

King Edward VI Stratford Upon Avon (Boys)