km ) ▁race ▁through ▁the ▁city ' s ▁streets ▁in ▁which ▁many ▁participants ▁run ▁in ▁cost ume . ▁ ▁The ▁Se af air ▁Week end ▁One ▁of ▁the ▁most ▁popular ▁events ▁of ▁the ▁festival ▁is ▁the ▁Se af air ▁Week end , ▁held ▁tradition ally ▁the ▁first ▁week end ▁of ▁August ▁on ▁Gen ese e ▁Park . ▁Se af air ▁Week end ▁main ▁events ▁include ▁hydro plane ▁racing ▁on ▁the ▁water ▁and ▁aer ob at ics ▁show ▁in ▁the ▁sky . ▁ ▁The ▁Se af air ▁Cup ▁is ▁an ▁American ▁Bo at ▁Racing ▁Association ▁un limited ▁hydro plane ▁racing ▁circuit ▁stop ▁at ▁ ▁Stan ▁Say res ▁Memorial ▁Park ▁on ▁Lake ▁Washington , ▁in ▁the ▁Mount ▁Baker ▁neighborhood . ▁The ▁races ▁attract ▁tens ▁of ▁thousands ▁of ▁spect ators , ▁both ▁those ▁standing ▁on ▁the ▁public ▁sh ores ▁of ▁the ▁lake , ▁and ▁those ▁in ▁boats ▁anch ored ▁just ▁outside ▁the ▁course ▁in ▁the ▁lake ▁itself . ▁ ▁A ▁tradition ▁started ▁in ▁ 1 9 7 2 , ▁the ▁Se af air ▁Air ▁Show ▁is ▁an ▁aer ob at ics ▁show ▁coinc ident ly ▁with ▁the ▁days ▁of ▁the ▁Se af air ▁Cup . ▁World - class ▁aer ob at ics ▁teams ▁perform ▁their ▁aer ial ▁st un ts ▁over ▁Lake ▁Washington , ▁most ▁prom in ently ▁the ▁US ▁Navy ▁Blue ▁Ang els ▁and ▁US ▁Army ▁Golden ▁Kn ights . ▁Not or iously , ▁the ▁Blue ▁Ang els ▁have ▁been ▁att ending ▁the ▁Air ▁Show ▁ann ually ▁since ▁its ▁first ▁edition , ▁except ing ▁in