2020    
29 February   British Ranking Event, Thorncombe Wood, Dorchester
7-8 March   Lipica Cup, Slovenia, 1 day PreO
21-22 March   BTOC, near Liphook, SE England
21-22 March WRE, ECTO Hungary, TempO + PreO
10 April   JK TempO, Stockton
11 April   JK PreO, Snainton Forest, near Whitby, N.Yorkshire
18-19 April WRE, ECTO Rakov Skocjan, Slovenia, 2 x PreO
24-26 April WRE Falco Cup, Lithuania
21-24 May   European TrailO Championships, Lohja, southern Finland. Info here
19-25 July   O-Ringen TrailO, Uppsala, Sweden
8-9 August WRE Finnish TrailO Championships, PreO + TempO
14-16 August WRE Bukowa Cup, Szczecin, Poland  TempO + PreO
19-20 September WRE, ECTO Nordic Match, Løten, Norway. TempO (not in ECTO) + 2 x PreO
10-11 October WRE, ECTO Asiago, Italy, TempO + PreO
7-8 November WRE, ECTO Slovakia, TempO + PreO
28 Nov. - 5 Dec.   World TrailO Championships, Hong Kong
     
2021    
20-24 July   World TrailO Championships, Poland

WRE = IOF World Ranking Event

ECTO = European Cup in TrailO

The following events usually have one or more TrailO competitions along with FootO competitions:

Portugal O-meet, February (PreO)

Lipica Open, Slovenia (PreO)

JK, Easter weekend (TempO + PreO)

British Orienteering Championships and British TrailO Championships (PreO) on the same weekend, same venue

Wawel Cup, Poland, July (PreO)

Swedish O-Ringen, July (5 x PreO)

Scottish 6-Days, July-August (PreO)

Hungaria Cup, August (4 x PreO)

Cerkno Cup, Slovenia, August (PreO)

White Rose Weekend, August (PreO)