I have never found the REAL guitar playing crowd to be interested in Stairway to Heaven. They normally want to hear something from Eddie Van Halen, Randy Scheckter, Joe Pass or Fernando Sor.
The same applies to the trumpet. The trumpetgeek wants to hear Maynard, Wynton, Maurice or Hakan. The casual listener Herb Alpert or Al Hirt.
It is useful to have a bag of rehearsed tricks. Never offer something that is out of YOUR musical reach. You never know who may be listening.