For me it's mainly all the swimming and athletics (evening sessions are a must) and all the artistic gymnastics finals.
Then - from Polish perspective - men's volleyball, women's singles tennis and speed climbing - women's speed.
Then all the road cycling and all the rowing, canoe sprint and canoe slalom finals.
Men's basketball, men's and women's handball and men's rugby sevens.
Men's singles tennis. Beach volleyball. All the triathlon events, men's golf (days 3 and 4). MTB, BMX races, track cyclng, equestrian jumping and eventing (mainly cross-country).
Then almost all the other sports - especially when Poles will be performing well. Women's volleyball, fencing, shooting, table tennis, modern pentathlon... And some sports where i don't think Poles will be strong or there will be no Poles at all - badminton, archery, diving... Combat sports are less interesting for me, but maybe some judo and men's boxing...
So almost everything actually...
I have my olympic 3-weeks vacation already secured long time ago, so it's time to look at the schedule and check the most interesting events of each day
Btw, this time all the olympic events will be broadcasted here in Poland on a new platform called MAX, which is not available here yet (they start in June i guess), i hope they will be no worse than Eurosport Player in Tokyo