My go-to contra corners dance when you have lots of newcomers is Linda Leslie's Corner Triplet.  Since it's a triplet, it's natural to have three walk throughs, so everybody gets a chance to do the contra corners figure.  It's a triplet, so you'll probably run through it only 9 times, which prevents people from getting too discouraged if they have trouble. The dance is very similar to Chorus Jig, so it's good training for the future.

Corner Triplet (Linda Leslie, 1991)

Proper triplet, ends (2, 3, 1)

A1.	(16)	1s dn center, turn alone, ret, cast off
A2.	(16)	1s turn contra corners
B1.	(16)	1s bal & sw; end facing up
B2.	( 8)	1s up center to top, separate to bottom
	( 8)	Lines of 3 fwd & bk