Can I participate directly in JoSAA counselling round 2 without participating in round 1?

No, you cannot join JoSAA Round 2 Counselling, if you haven't registered and appeared in Round 1. For this situation, you have to go for CSAB Special Counselling Registration 2024. SAB round is conducted for 25 IIITs, 31 NITs, and 28 Centrally Funded Technical Institutes (CFTIs) to participate in the JEE Main counseling. CSAB Rounds can be divided into CSAB NEUT and CSAB SFT. Check 

• CSAB NEUT (North East and Union Territories) is the counseling process organized by the Central Seat Allocation Board (CSAB) for supernumerary seats in North East and Union Territories.
• CSAB SFTI (Self Financing Technical Institutes) is a specific counseling process organized by the Central Seat Allocation Board (CSAB) for the 17 SFTIs. Check Who is eligible for the CSAB special round counselling 2024?

More information on CSAB IIIT Opening and Closing Ranks 2024 and CSAB NIT Opening & Closing Ranks 2024 is available.