Pesachim Daf 116 - If you put yourself at danger for a Mitzvah are you Yotzei (Covid Minyanim and sheva Brochos etc)
Pesachim Daf 102 - אין עושין מצוות חבילות חבילות - Can you give Tzedaka to two people simultaneously?
Pesachim Daf 95 - if Moshiach comes in between Pesach Rishon and Pesach Sheini would we bring a Korban Pesach?