Quick answer
With friends, go for atmosphere: a sports bar for energy and multiple screens, a lively city-centre café for friendliness, or a public big screen for the big games. For a large group, book a big table at a restaurant with a screen.
Choosing for your group
For a small group, a lively café or a sports bar is enough; for a large group, it is best to book a big table in advance. Make sure everyone will see the screen, and pick a central, easy-to-reach venue for all.
