adherent
applauder
appreciator
attender
audience
booster
buff
commender
deadhead
encomiast
eulogist
eulogizer
extoller
fan
groundling
hired applauder
lauder
moviegoer
panegyrist
pass holder
playgoer
plugger
praiser
promoter
puffer
rooter
spectator
standee
theatergoer
tout
touter