RL Items there a particular public space for that

gatherings, nor is RL Items there a particular public space for that reason. 

Rocket League exchanging: How to send a welcome .

In the event that you need to exchange with somebody, they should be in your Friends list. Then, at that point, either join their gathering or welcome them to www.lolga.com yours, click on their symbol (found in the lower bar along the edge of your profile) and select 'welcome to exchange'.