"A Ministry of Magic Masking Fog will be created ten minutes before start of play. Spectators are therefore advised to arrive early."
-- Match Information (DP2)
"Friday: Holyhead Harpies versus Puddlemere United. Ministry of Magic seeks to minimize crowd trouble: wands will be confiscated at the gates and the Magical Law Enforcement Squad will be out in force. Ilkley Moor."
-- Match Information (DP3)
A regular sports feature appearing in the Daily Prophet.
Heading up the Sports section of the Daily Prophet, the League Table sets out the current standings for the League and notices for both League and international Quidditch fixtures. (DP1, DP2, DP3, DP4)
Reflecting the volatile nature of the game, the team standings (both up and down) change in each issue of the Daily Prophet.
The manager of the Chudley Cannons says "we might not be relegated" after a win against the Wigtown Wanderers (DP3) and a later article mentions that the Falmouth Falcons are "almost certain to be relegated" after their loss against the Cannons (DP4).
If teams can be relegated this implies that there is a lower league into which they will go (and also that a team will correspondingly come up to replace them).
However, in Quidditch Through the Ages it states that
"....professional Quidditch teams have been limited in number since 1674 when the League was established. At that time, the thirteen best Quidditch teams in Britain and Ireland were selected to join the League and all others were asked to disband. The thirteen teams continue to compete each year for the League Cup." (QA7)