I have a few questions about meat and Hadran (Hadran for finishing a tractate of Talmud)
Can you make a Siyum without meat?
If yes then can you say Hadran without meat?
You do not need to eat meat to have a siyum. To just wash for bread or just to even have cake with soda is good enough. See Horav Chaim Kanievesky Shlita quoted in Yoma Tova L’rabanan page 107:4, refer to Orchos Rabbeinu 2:page 57:6.
The Reason why we can eat during the nine days is because we are making a seudas mitzvah, but then again you do not need to. Rama 551:10 And Elya Rabbah 26, Chai Adom 133:16, Aruch Ha’shulchan 28, Eretz Tzvi 1:79,