Yeap, you're allowed to gift (transfer) someone up to 5K in RC's, if you have it. Depending which lounge you go to, IMO, it's not really worth the $10 in RCs to go into any of them in Vegas. AC is a different story.
If you happen to have decent play with them, can always stop by a host office to see if they are able to comp you into the lounge. But if you have zero play or it's a tier match, then chances are slim to none.