WINGTIP HIT SEVERAL TENT POLES.

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WE TOOK THE TXWY TO DEPART RWY 28. WE WERE RUNNING THE CHKLIST AS USUAL. THE PIC WAS IN THE R SEAT AND I WAS IN THE L. THE PIC WAS SETTING UP THE NAV INSTS FOR THE FLT HOME. I SAW A TENT TO THE R OF THE TXWY. IT HAD BEEN PLACED THERE FOR AN UPCOMING AIRSHOW. IT SEEMED CLOSE TO THE TXWY. THERE HAD BEEN NO NOTAM ISSUED CONCERNING THE TXWY. I KNEW I SHOULD HAVE ADEQUATE CLRNC IF I STAYED ON THE CTRLINE; BUT TO BE CAUTIOUS I MOVED THE NOSEWHEEL TO THE L APPROX 1 1/2-2 FT. I COULD NOT SEE THE R WINGTIP FROM MY POS. I WAS CONCERNED ABOUT MOVING MUCH FURTHER L BECAUSE I DIDN'T WANT THE L MAIN TO ENTER THE GRASS. THE PIC WAS STILL INSIDE THE COCKPIT SETTING THE VLF/OMEGA. WE STRUCK THE TENT. I IMMEDIATELY STOPPED. WE TAXIED BACK TO THE FBO. IN CONSIDERING OUR CREW ERRORS; THERE WAS A LACK OF COM INVOLVED. THE PIC HAD SEEN THE TENT UPON LNDG; BUT HAD NOT GIVEN ME ANY INDICATION HE WAS CONCERNED WITH HOW CLOSE IT WAS. ALSO; AS WE APCHED THE TENT I DID NOT ASK HIM TO CHK THE WING TO SEE IF I HAD ADEQUATE CLRNC. IT MIGHT HAVE HELPED IF HE DIDN'T HAVE HIS HEAD INSIDE THE COCKPIT FOR THE ENTIRE TAXI. ALSO; I SHOULD NOT HAVE ASSUMED THE CTRLINE WOULD PROVIDE CLRNC. I USED BAD JUDGEMENT IN NOT ASKING HIM TO CHK THE WINGTIP. SUPPLEMENTAL INFO FROM ACN 280519: ON FINAL APCH TO THE FIELD; I NOTICED SEVERAL TENTS SET UP AROUND THE ARPT GNDS. ONE WAS SET UP DIRECTLY ADJACENT TO THE PARALLEL TXWY FOR THE MAIN RWY. I BEGAN INITIALIZING THE R-NAV UNIT AND PROGRAMMING IT FOR OUR LEG BACK HOME. THE MIT HAD BEEN UNRELIABLE EARLIER IN THE DAY. SUDDENLY REMEMBERING THE ODD PLACEMENT OF THE TENT; I LOOKED UP AND TO THE R JUST AS THE TIP OF OUR R WING STRUCK THE CORNER POST OF THE TENT. THE WING STRUCK THE REMAINING 3 POSTS OF THE OUTSIDE WALL OF THE TENT. THE R WINGTIP HAD BEEN DAMAGED.