Here is a collection of all the known Regionals so far in Europe. You can also send me a PM and I’ll update it here.
12-Nov: National: Belgium, Gent
Past ones:
15-May: Regional: Sweden, Stockholm
20 & 21-May: Regional: Netherlands, Den Haag
20-May: Regional: Denmark, Copenhagen
25 May: Regional: Sweden, Linköping
27-May: Regional: Poland, Katowice
27-May: Regional: Netherlands, Haarlem
2-4-Jun: Euros: UK, Birmingham
10-Jun: Regional: Czechia, Prague
10-Jun: Regional: Germany, Düsseldorf
10-Jun: Regional: Sweden, Malmö
10 & 11-Jun: Regional: UK, Norwich
17 & 18-Jun: Regional: Poland, Wrocław
17 & 18-Jun: National: Madrid, Spain
17-Jun: Regional: Slovakia, Bratislava
17-Jun: Regional: Finnland Helsinki
17-Jun: Regional: UK, Stirling
17-Jun: Regional: Norway, Oslo
24-Jun: Regional: Germany, Hamburg
24-Jun: Regional: UK, London
24-Jun: Regional: Hungary, Budapest
25-Jun: Regional: Belgium, Antwerp
1-Jul: Regional: Spain Barcelona
1 & 2-Jul: Regional: UK, Reading
2-Jul: Regional: Germany, Göttingen
15-Jul: Regional: UK, Huddersfield
15 & 16-Jul: Regional: Sweden, Varberg
15 & 16-Jul: Regional: Spain, Valencia
22-Jul: Regional: Belgium, Gent
22-Jul: Regional: Poland, Warsaw
23-Jul: Regional: Ireland, Kilkenny
29 & 30-Jul: Regional: Germany, Ulm
29-Jul: Regional: UK, Preston
5-Aug: Regional: UK, Swansea
5-Aug: Regional: UK, Sheffield
5-Aug: Regional: Belgium, Leuven
12-Aug: National: Netherland, Enschede
19-Aug: Regional: Switzerland, Bern
19-Aug: Regional: UK, Poole
26 & 27-Aug: National: Germany, Düsseldorf
26 & 27-Aug: National: Sweden (Nordics), Varberg
26-Aug: Regional: Czechia, Brno
1-3-Sep: National: Poland, Wrocław
9-Sep: Regional: Spain, Madrid
15-17-Sep: National UK, Liverpool
16 & 17-Sep: National France, Paris
23-Sep: Regional: Spain, Bilbao
30-Sep: Regional: Spain, Sevilla
30-Sep: Nationals: Greece, Athens
30-Sep & 1-Oct: Regional: Lettland, Riga
7-Oct: Regional: Spain, Logroño
7-Oct: National: Slovakia, Bratislava
14-Oct: National: Russia, Moscow
28-Oct: National: Hungary, Budapest