Time travelers invited to Stephen Hawking memorial

My students and I in my high level lesson yesterday found out that time travelers have been invited to attend the memorial service for Professor Stephen Hawking. The legendary physicist, cosmologist and author died on March 14. Thousands of fans and well-wishers lined the streets in Cambridge, England for his funeral two weeks later. His family has now arranged a special ceremony to allow people to remember and celebrate his life, and time travelers have been invited.