For as long as the NBC Olympics website keeps their replays up, you can go back and watch all the events from the Rio Olympics online on your PC or the NBC app as long as you have a subscription.Rather than navigate their website, here are simple lists of medal event online replay streams by day without spoilers:
Day 1 (Aug 06) Olympic Medal EventsDay 2 (Aug 07) Olympic Medal EventsDay 3 (Aug 08) Olympic Medal EventsDay 4 (Aug 09) Olympic Medal EventsDay 5 (Aug 10) Olympic Medal EventsDay 6 (Aug 11) Olympic Medal EventsDay 7 (Aug 12) Olympic Medal EventsDay 8 (Aug 13) Olympic Medal EventsDay 9 (Aug 14) Olympic Medal EventsDay 10 (Aug 15) Olympic Medal EventsDay 11 (Aug 16) Olympic Medal EventsDay 12 (Aug 17) Olympic Medal EventsDay 13 (Aug 18) Olympic Medal EventsDay 14 (Aug 19) Olympic Medal EventsDay 15 (Aug 20) Olympic Medal EventsDay 16 (Aug 21) Olympic Medal Events