This listing is current as of Aug. 30, 2012.
AustriaLINZ: Ars Electronica, festival for art, technology and society, through Sept. 3.
BASEL: Theater festival, through Sept. 8.
VIENNA: Vienna Classic Days, classic cars throughout city, Sept. 8-9.
VIENNA: Vienna Masters 2012, Global Champions Tour, horse riding and show jumping tournament, Sept. 20-23.
VIENNA: Wies’n fest in the Prater, Sept. 27-Oct. 7.
SALZBURG: Jazz & The City, free concerts in the city center, Oct. 10-14.
BelgiumBRUSSELS: Royal Palace open to visitors, through Sept. 9.
BRUSSELS: Beer weekend, Aug. 31-Sept. 2.
WERVIK: Celtic Night Geluwe, small folk festival, tickets cost 15 euros, Aug. 31-Sept. 2.
ANTWERP: Laundry Day, street party, tickets needed, Sept. 1.
LESSINES: Renaissance Festival, Sept. 1-2.
SAINT-HUBERT: International hunting and nature days, Sept. 1-2; historical procession 2:30 p.m. Sept. 2.
BRUSSELS: Car-free Sunday, Sept. 16.
BRUGGE: Jazz Brugge, tickets needed, Oct. 4-7.
Czech RepublicZATEC: Celebration of hops and beer, through Sept. 1.
PRAGUE: Verdi Festival of Italian Opera, State Opera, through Sept. 7.
HRADEC KRÁLOVÉ: Queen Eliška Celebrations, medieval fair, Aug. 31-Sept. 1.
PRAGUE: Midsummer night’s dream festival, free concerts by Charles Bridge, Sept. 1-8.
MIKULOV: Palava Wine Festival, Sept. 7-9.
PRAGUE: World Dance Sport Competition, Praha Arena Sparta, Sept. 8-9.
JICIN: A town of fairy tales, traditional fest, Sept. 12-16.
ZNOJEMSKE: Historical wine festival, Sept. 14-15.
MOSNOV: NATO days in Ostrava, central Europe’s largest military show, Sept. 15-16.
KARLSTEJN: Wine festival at the castle, Sept. 29-Oct. 1.
DenmarkAARHUS: Fest week, with music, theater, literature, food and film, Aug. 31-Sept. 9.
COPENHAGEN: Blues Festival, Sept. 28-Oct. 2.
EnglandISLE OF WIGHT: Bestival, boutique music festival with attendees in fancy dress, Sept. 6-9.
LONDON: Thames Festival, Sept. 8-9.
LONDON: The Great River Race, racing on the Thames in strange costumes, Sept. 15.
LONDON: Open House London, public access to private venues, Sept. 22.
FranceLILLE: Braderie, giant flea market, Sept. 1-2.
MARSEILLE: Water Jousting Championships, Sept. 2.
PARIS: Fete du Ganesh, Indian Festival and Parade, Sept. 2.
PARIS: Biennale des Antiquaires, prestigious antiques fair at the Grand Palais, Sept. 14-23.
PARIS: Techno Parade, Sept. 15.
PARIS: La Grande Classique, walk from the Eiffel Tower to Versailles, registration necessary, Sept. 30.
PARIS: Nuit Blanche, nocturnal art festival, Oct. 6.
GermanyMAINZ: Wine fest in Stadtpark, through Sept. 2.
WORMS: Backfischfest, volksfest, through Sept. 2.
KAISERSLAUTERN: Barbarossa Fest “Swinging Lautern,” free live music program in the city, through Sept. 3.
FRANKFURT: Rheingau wine market on the Fressgass, through Sept. 7.
NUREMBERG: Herbsvolksfest, through Sept. 9.
STUTTGART: Wine Village, through Sept. 9.
KASSEL: (d)OCUMENTA(13), contemporary art, through Sept. 16.
KARLSRUHE: Bierbörse (beer exchange), Aug. 31-Sept. 2.
TRIER: Bread and Circuses, Roman festival, Aug. 31-Sept. 8.
PASSAU: Barockspektal “Passau PArockt” celebrates Baroque style with artisan market, parade, music and more, Aug. 31-Sept. 2.
HEIDELBERG: Castle illuminations, Sept. 1.
RUSSELSHEIM: Mainland Games, Scottish Highland games, Sept. 1-2.
AACHEN: European Market with arts, crafts and designers, city center near cathedral, free entry, Sept. 1-2.
AACHEN: Domspringen, pole vaulting in the area between the town hall and cathedral, Sept. 5.
BONN: Pützchens Markt, fun fair and market in Beuel-Pützchen district, Sept. 6-11.
LUDWIGSBURG: Venetian Fair, Sept. 7-9.
BAD DÜRKHEIM: Wurstmarkt, huge wine fest, Sept. 7-11 and 14-17.
NUREMBERG: Trempelmarkt, one of Germany’s biggest flea markets, Sept. 7-8.
OBERWESEL: Rhine in Flames, Sept. 8.
ST. GOAR: St. Goarshausen, Rhine in Flames, Sept. 15.
TRIER: Museum Night, Sept. 15.
ULM: Night of Culture, Sept. 15.
NUREMBERG: Old Town Festival, Sept. 13-24.
NUREMBERG: Autumn market, Sept. 13-30.
SAARBRÜCKEN: Gourmet marathon and half-marathon, Sept. 16.
BONN: Klangwelle, show of music, water, fire, light and lasers, Münsterplatz, Sept. 22-Oct. 3.
MUNICH: Oktoberfest, Sept. 22-Oct. 7.
AMBERG: Michaeli Dult, Volksfest, Sept. 21-Oct. 3.
HEIDELBERG: Autumn Fair, Sept. 29.
BAD DÜRKHEIM: Middle Ages Market, Sept. 29-30.
BONN: Bonn Fest, music, fashion and food stalls, Sept. 29-30.
FURTH: Michaelis Kirchweih, Sept. 29-Oct. 10.
HungaryBUDAPEST: Jewish Summer Festival, Dohany Street Central Synagogue, through Sept. 3.
BUDAPEST: International wine festival, Buda Castle, Sept. 12-16.
BUDAPEST: National Gallop, celebration of Hungarian traditions and horseback riding, Sept. 15-16.
BUDAPEST: Sweet Days Chocolate and Sweets Festival, Buda castle, Sept. 20-23.
DUBLIN: Fringe Festival, multidisciplinary arts fest, Sept. 8-23.
DUBLIN: Culture Night, museums, churches and cultural institutions offer free entertainment, Sept. 21.
LISDOONVARNA: Matchmaking festival, Aug. 31-Oct. 7.
ItalyVENICE: La Biennale, international film festival, through Sept. 8.
VENICE: Regata Storica, historical water pageant, Sept. 2.
MAROSTICA: Human chess game, Sept. 7-9.
TRENTO: Palio delle Contrade, historical battle re-enactment, Sept. 7-9.
SOAVE: Festa dell’Uva, wine festival, Sept. 14-16.
LuxembourgCITY: Schueberfouer, fun fair on Glacis Square, through Sept. 11.
ECHTERNACH: Europiade, hiking in the German-Luxembourg National Park, Sept. 7-9.
REMICH: Half marathon on the Route du Vin, Sept. 30.
NetherlandsVENLO: Floriade 2012 World Horticultural Expo, through Oct. 7.
AMSTERDAM: Pluk de Nacht, open air film festival with independent films, through Sept. 1.
COUNTRYWIDE: Heritage Days, thousands of historical buildings open to the public, Sept. 8.
LICHTENVOORDE: Flower Parade, Sept. 9.
AMSTERDAM: Africa in the Picture, festival of African film at the Westergasfabriek, Sept. 24-27.
ScotlandEDINBURGH: International Festival, through Sept. 2.
BRAEMAR: Braemar Gathering, highland games, Sept. 1.
PITLOCHRY: Highland games, Sept. 8.
EDINBURGH: Sky Ride, cycle through city streets free of traffic, Sept. 8.
SpainVILLAFRANCA DE PENEDES: Festa Major, includes human pyramids, through Sept. 2.
SEVILLE: La Bienal, Flamenco festival, Sept. 3-30.
BAZA: Cascamorras Festival, Sept. 6-9.
JEREZ DE LA FRONTERA: Fiestas de la Vendimia, Sept. 11-16.
LONGROÑO: Rioja Wine Harvest Festival, Sept. 15-22.
BARCELONA: Mercè Festival, Sept. 21-24.
SwitzerlandBASEL: International Theater Festival, through Sept. 9.
BIEL/BIENNE: Old Town Fair, Aug. 31-Sept. 2.
ZURICH: Long Night of Museums, Sept. 1.
LEUKERBAD: Swiss Country Music weekend, folk music concerts, Sept. 28-30.