I'm a Rugby Union novice. It's my friends 50th in Feb. What chance me getting 6 nations tickets?

Ideally for 10-15 people. Ideally 25th Feb. Ideally in a good city for a weekend away. If 6 nations is no hope re tickets are there "fan parks" like the world cup in footy? Is there a less high profile rugby union alternative to 6 nations?