If you are into speedway, I would be looking at getting over to watch at least one of the speedway GP rounds on about that time of the year. GP dates are Terrenzano, Italy on the 3rd of August; Daugavpils, Latvia on the 17th of August; Krsko, Slovinia on the 7th of September; Stockholm, Sweden on the 21st of September. The GP at Stockholm is at a covered arena, so there should be no worries of a weather affected event. Two Aussies competing, with Chris Holder defending his World title and Darcy Ward, so there should be plenty to cheer about. There may even be three Aussies in the mix by then, as Troy Bachelor is on the reserves list, if anyone of the qualified riders is injured in the earlier rounds.
Of course I also wouldn't be missing the Farleigh Castle VMXDN, usually on around mid to late September. The Linkoping, Sweden VMX event is usually on around the last week in July or the first week in August as well.