Ayr, Currie, GHA, Highland, Mackie, Madras, North Berwick and Stirling County will all contest the tournament, which is a follow-up to Currie's annual mini-rugby event, which took place last weekend.
A Currie spokesperson says: "There will be eight clubs representing each of the regions of Scotland, making this a truly national tournament.
"The teams invited represent what has been shown to be the strongest and most talented squads at this level for the season."
Meanwhile, Dalkeith, who consolidated promotion to East Division One last season by finishing halfway up the table, have made centre Ryan Reid a double winner at their annual prizegiving dinner.
Reid marked a return to the game by claiming both the player of the year award and also the coaches' player of the year trophy.
Most improved player was flanker Chris Allan, while stand off/centre Paul Clugston earned the players' player of the year accolade.
Dalkeith president Martin Ross said: "Chris Allan worked hard on basic skills to become an ever-present while Paul Clugston spent hours re-structuring his place-kicking style to gain a 90 per cent success rate over the last third of the season.
"All he really lacks is a bit more belief in his ability.
"Ryan Reid's return not only strengthened our attack and defence but gave confidence to those around him."
Second team player of the year was Dario Rae.