The New Computer Museum collects, preserves and exhibits a variety of classic games. The collection includes a range of vintage PC era computers loaded with hundreds of game titles.
There will also be systems set up with emulators available online.
These are just a few examples of famous games fully available in emulators online. Click the pictures to go to the site and play.
How to Turn Your PC (or Other Device) Into a Retro Arcade with Lakka (Patrick Allan, Life Hacker)
Classic Games on Steam
Internet Arcade (Internet Archive)
Multiple Arcade Machine Emulator (MAME)
List of video game emulators (Wikipedia)
The New Computer Museum hosts events so that the public can learn about and enjoy the vintage games and interfaces collection firsthand.