The three biggest & best German fairs at that time of year are the Rheinkirmes in Dusseldorf (12-21 July), the Hamburg Dom (19. July-18. Aug.) & the Annakirmis in Düren (27. July-4. Aug).
Exact ride lineups have not been confirmed, but below is what you can expect.
Major Rheinkirmes attractions:
Alpina Bahn (huge Schwarzkopf non-looper)
Höllenblitz (crazy weird fab indoor coaster)
Spinning Racer (Maurer Söhne wild mouse spinner)
Wilde Maus (Maurer Söhne wild mouse classic)
Konga (new themed version of XXL)
Star Flyer II (world's largest transportable star flyer*)
Power Tower (world's largest transportable shoot & drop tower*)
Wildwasser III (world's largest transportable log flume)
Rio Rapidos (world's largest transportable rapids ride)
Spin 'n Spews (including Breakdance No. 1, Shake 'n' Roll & Devil Rock)
& three ghost trains (Daemonium, Geisterstadt & Die große Geisterbahn)
Major Dom attractions:
Teststrecke (Schwarzkopf double-looper)
Wilde Maus (Maurer Söhne wild mouse classic)
Sky Dance (world's largest transportable star flyer*)
Power Tower II (world's largest transportable shoot & drop tower*)
Rocket or Sky Rocker (large Afterburners)
Atlantis Rafting (transportable rapids ride)
Spin 'n Spews (including Transformer, Shaker, Dom Dancer, Break Dancer No. 2, Airwolf & Action)
& three ghost trains (Geister, Geistertempel & Geisterbahn)
Major Annakirmes attractions:
Olympia Looping (Schwarzkopf five-looper & world's largest transportable coaster)
Rock & Roller (Schwarzkopf Wildcat)
Booster Maxxx - Mega 4G (KMG Speed ride)
XXL (huge Afterburner)
Star Flyer
Piraten-Fluss (log flume)
Spin 'n Spews (including Break Dance No. 1 & High Impress)
& two ghost trains (Geisterschloss & Die große Geisterbahn)
*The rides are the same size so that both can claim to be the world's largest.