 Another Tamalpa institution is the Tamalpa Club Racing Series (TCRS), founded in 1983 as a series of low-key cross country running events.TCRS races are held every month except June (in honor of the Dipsea) and December (in deference to Tamalpa Christmas Party hangovers).The TCRS courses are a combination of various traditional courses in Marin County selected each year by the club's race directors.