Sub-Regional gatherings are organised to take place the year after the World Conference. These events give members the opportunity to meet in fellowship together, to discuss cultural and other items of common interest and to further the work of the ISGF.
The organisers are encouraged to conduct these meetings and gatherings in a language which is understood by the majority of the participants.
Western Europe Sub-Regional gatherings:
| Year | Venue | Country | Date | Participants | |
| 1 | 1958 | Bilthoven | Netherlands | 8-11 August | 38 |
| 2 | 1960 | Villers-la Ville | Belgium | ||
| 3 | 1962 | Foxlease | United Kingdom | 26-29 October | 40 |
| 4 | 1964 | Wiltz | Luxembourg | 31 July-3 August | 77 |
| 5 | 1966 | Dublin | Ireland | 26-29 August | 130 |
| 6 | 1968 | Oegstgeest | Netherlands | 19-22 April | 72 |
| 7 | 1970 | Mozet | Belgium | 7-11 April | |
| 8 | 1972 | Leicester | United Kingdom | 19-23 July | 104 |
| 9 | 1974 | Petange | Luxembourg | 19-23 July | 147 |
| 10 | 1976 | Dublin | Ireland | 17-22 July | 101 |
| 11 | 1978 | Driebergen | Netherlands | 20-24 April | 185 |
| 12 | 1980 | Blankenberge | Belgium | 24-29 July | 313 |
| 13 | 1982 | York | United Kingdom | 23-27 September | 219 |
| 14 | 1984 | Luxembourg | Luxembourg | 27-31 July | 283 |
| 15 | 1986 | Dublin | Ireland | 184 | |
| 16 | 1988 | Noordwijkerhout | Netherlands | 100 | |
| 17 | 1990 | Borzee | Belgium | 250 | |
| 18 | 1992 | Edinburgh | United Kingdom | 300 | |
| 19 | 1994 | Dommeldange | Luxembourg | 22-27 July | 75 |
| 20 | 1997 | Dublin | Ireland | 19-24 June | 230 |
| 21 | 2000 | Elspeet | Netherlands | 28 May-2 June | 159 |
| 22 | 2003 | Houthalen-Helchteren | Belgium | 16-23 June | 128 |
| 23 | 2006 | Clervaux | Luxembourg | 16-21 June | 67 |
| 24 | 2009 | Dundee | United Kingdom | 18-22 August | 101 |
| 25 | 2012 | Cork | Ireland | 24-29 Sept. | 130 |
| 26 | 2015 | Oostduinkerke | Belgium | 7-11 Sept. | 76 |
| 27 | 2018 | Eastbourne | United Kingdom | 8-12 Oct. | 101 |
| 28 | 2022 | online meeting | United Kingdom | 11 Sept PM | |
| 29 | 2025 | The Netherlands | 10 - 14 October |
Nordic Baltic Sub-Regional gatherings:
| Year | Venue | Country | Date | Participants | |
| 1 | 1954 | Hanko Bad | Norway | 29-30 May | |
| 2 | 1956 | Otnäs | Finland | ||
| 3 | 1958 | Vallekilde | Denmark | ||
| 4 | 1960 | Sigtuna | Sweden | ||
| 5 | 1962 | Trondheim | Norway | 205 | |
| 6 | 1964 | Helsingfors | Finland | ||
| 7 | 1966 | Krogerup | Denmark | 11-15 July | 104 |
| 8 | 1968 | Mariefred | Sweden | ||
| 9 | 1970 | Reykjavik | Iceland | 107 | |
| 10 | 1972 | Skinnarbu | Norway | ||
| 11 | 1974 | Runsala | Finland | 3-7 July | 200 |
| 12 | 1976 | Nyborg | Denmark | ||
| 13 | 1978 | Stockholm | Sweden | ||
| 14 | 1980 | Reykjavik | Iceland | 30 June-4 July | 300 |
| 15 | 1982 | Lillehammer | Norway | 21-25 June | 500 |
| 16 | 1984 | Espo | Finland | 311 | |
| 17 | 1986 | Bornholm | Denmark | 450 | |
| 18 | 1988 | Skoevde | Sweden | 280 | |
| 19 | 1990 | Reykjavik | Iceland | 300 | |
| 20 | 1992 | Molde | Norway | 21-22 June | 460 |
| 21 | 1994 | Aulanko | Finland | 300 | |
| 22 | 1997 | Faaborg | Denmark | 24-28 June | 250 |
| 23 | 2000 | Mora | Sweden | 26 June - 1 July | 138 |
| 24 | 2003 | Akureyri | Iceland | 24-29 June | 400 |
| 25 | 2006 | Bodø | Norway | 21 - 25 June | 170 |
| 26 | 2009 | Mariehamm, Åland | Finland | 10-14 June | 165 |
| 27 | 2012 | Birstonas | Lithuania | 14-17 June | 98 |
| 28 | 2015 | Horsens | Denmark | 26-30 June | 79 |
| 29 | 2018 | Gothenburg | Sweden | 24-28 August | 65 |
| 30 | 2022 | Selfoss | Iceland | 26 - 30 May | 78 |
| 31 | 2025 | Norway |
Prior to Nordic Baltic Gatherings there were separate Baltic Gatherings named Balttreff
| Year | Venue | Country | Date | Participants | |
| 1 | 1995 | Tallinn | Estonia | 11 - 13 August | 20 |
| 2 | 1999 | Riga | Latvia | 5 - 9 August | 35 |
| 3 | 2002 | Trakai | Lithuania | 4 - 8 September | 55 |
| 4 | 2005 | Nelijärve | Estonia | 17 - 21 August | 45 |
Central Europa Sub-Regional conferences:
| Year | Venue | Country | Date | Participants | |
| 1 | 1993 | Nyiregyháza | Hungary | 29 Aug.- 2 Sept. | 50 |
| 2 | 1998 | Friesach | Austria | 29 Aug. -5 Sept. | 120 |
| 3 | 2001 | Budapest | Hungary | 19 - 20 June | 60 |
| 4 | 2003 | Banska Stiavnica | Slovakia | 27 - 31 August | 214 |
| 5 | 2006 | Rothenburg | Germany | 30 Aug. - 3 Sept. | 185 |
| 6 | 2009 | Mamaia | Romania | 3 - 6 September | 63 |
| 7 | 2012 | Pilsen | Czech Rep. | 15 - 19 August | 86 |
| 8 | 2015 | Zeillern | Austria | 23 - 27 Sept. | 80 |
| 9 | 2018 | Poznan | Poland | 5 - 9 September | 60 |
| 10 | 2021 | Puck | Poland | 19 - 26 Sept. | 44 |
| 11 | 2024 | Nitra | Slovakia | 3 - 6 October. |
Prior to Central Europe there were Alpine Countries Sub-Regional gatherings:
| Year | Venue | Country | Date | Participants | |
| 1 | 1960 | Sion | Switzerland | ||
| 2 | 1966 | Genève | Switzerland | 76 | |
| 3 | 1971 | Obernai | France | ||
| 4 | 1974 | Einsiedeln | Switzerland | 55 | |
| 5 | 1976 | Tours | France |
Mediterranean/Southern Europe Sub-Regional gatherings:
| Year | Venue | Country | Date | Participants | |
| 1 | 1980 | Athens | Greece | 25 - 29 October | 75 |
| 2 | 1982 | Sorrento | Italy | 27 - 31 May | |
| 3 | 1984 | Hammamet | Tunesia | 14 - 19 May | |
| 4 | 1986 | El Escorial | Spain | 2 - 7 June | |
| 5 | 1988 | St. Aygulf | France | 3 - 8 October | 300 |
| 6 | 1990 | Lisbon | Portugal | 16 - 22 November | 320 |
| 7 | 1992 | Sousse | Tunesia | 17 - 24 May | 250 |
| 8 | 1994 | Peniscola | Spain | 5 - 10 June | 117 |
| 9 | 1997 | Arles | France | 30 June - 5 July | 150 |
| 10 | 2000 | Eretria | Greece | 2 - 7 October | |
| 11 | 2003 | Marrakech | Morocco | 5 - 11 October | |
| 12 | 2006 | Acireale,Sicily | Italy | 7 - 12 November | 500 |
| 13 | 2009 | Tavira | Portugal | 20 - 25 October | 137 |
| 14 | 2012 | Cadiz | Spain | 31 Oct. - 5 Nov | 202 |
| 15 | 2015 | Marrakech | Morocco | 22 - 27 October | 180 |
| 16 | 2018 | Athens | Greece | 19 - 24 October | 195 |
| 17 | 2022 | Ayia Napa | Cyprus | 24 - 29 October | 78 |
| 18 | 2025 | Tunisia |
Eastern Africa Sub-Regional gatherings:
| Year | Venue | Country | Date | Participants | |
| 1 | 2015 | Kampala | Uganda | 1 - 5 September | 35 |
| 2 | 2018 | Dar es Salaam | Tanzania | 25 - 29 June | cancelled |
Southern Africa Sub-Regional gatherings:
| Year | Venue | Country | Date | Participants | |
| 1 | 2015 | Lusaka | Zambia | 11 - 15 June | 28 |
| 2 | 2018 | Victoria Falls | Zimbabwe | 10 - 12 August | 8 |
Western Africa Sub-Regional gatherings:
| Year | Venue | Country | Date | Participants | |
| 1 | 2018 | Cotonou | Benin | 5 - 9 November | 18 |
South America Sub-Regional gatherings:
| Year | Venue | Country | Date | Participants | |
| 1 | 2010 | Alta Gracia | Argentina | 11 - 13 October | 12 |
| 2 | 2011 | Piriápolis | Uruguay | 8 - 10 October | 15 |
| 3 | 2012 | Quilpué | Chile | 12 - 16 October | 38 |
| 4 | 2015 | Agua de Oro | Argentina | 10 - 12 October | 26 |
| 5 | 2018 | Salinas | Uruguay | 2,3,4 November | 44 |
| 6 | 2022 | Online | 29 Oct | 35 |
