Rental Supply Of The Ground Support Supertruss Structure And The Specialized Technical Assistance Service For Its Installation, Assembly, Operation, Revisions And Disassembly, As Well As The Delivery And Removal Transport Of The Material And The Issuance Of The Certificate Of Structural Soundness Of The Assembled Structures, For The Performance Of The Shows Scheduled At The Greek Theater During The Editions Of The Grec Festival In Barcelona 2026 And 2027.