The first place to visit is of course the Crossfight homepage. There you will see all the currently participating teams and who you may challenge, denoted with the 
challenge icon.
You may challenge teams from Friday to Sunday. When you click the challenge icon, you have several choices. These are: day of the proposed match, time, as well as any other infos you may wish to provide like server details. When you confirm a challenge, the recipient team has several options:
1) Accept the challenge and set the match details as final
2) Query the challenge and dispute the time or day.
3) Wildcard the challenge - teams have 1 wildcard every 3 games. EG Wildcard game 1, play games 2,3,4, wildcard game 5, etc.
Queries can be returned 3 times. This means that if no date or time can be agreed, the higher placed team receives a forfeit loss. This aids activity in the ladder.
Currently, we are working to generate random match channels for confirmed games. For now we will continue to use #crossfight. We reserve the right to add any game to ETTV, if any team has a specific problem with this, please contact us.
challenge icon.You may challenge teams from Friday to Sunday. When you click the challenge icon, you have several choices. These are: day of the proposed match, time, as well as any other infos you may wish to provide like server details. When you confirm a challenge, the recipient team has several options:
1) Accept the challenge and set the match details as final
2) Query the challenge and dispute the time or day.
3) Wildcard the challenge - teams have 1 wildcard every 3 games. EG Wildcard game 1, play games 2,3,4, wildcard game 5, etc.
Queries can be returned 3 times. This means that if no date or time can be agreed, the higher placed team receives a forfeit loss. This aids activity in the ladder.
Currently, we are working to generate random match channels for confirmed games. For now we will continue to use #crossfight. We reserve the right to add any game to ETTV, if any team has a specific problem with this, please contact us.
I'd guess not (since if so it brings up questions about what the hell happens if they win vs the higher team and lose vs the lower one), in which case, what stops teams being 'safe' from relegation every week simply by challenging teams above them? Even if they lose they don't drop positions, and there's no way a lower ranked team can challenge them, so they won't drop positions that way either.
hf teams!
Of course you could just use gtv for that, I guess.