I have picked up your correction and I am working on that.
Busy day
I am in a KOTESOL conference today.
The presentations that I Joined attended were great!!!
A busy but happy day!
I think that the verb "to attend" is better here than the verb "to join"
and we want the past tense. Both verbs form the past tense by adding -ed at the end.
join ---> past ----> joined
attend --> past ---> attended.
There are a lot of English language verbs that are not regular, for example
see ---> past --> saw (not seeed which would be very strange)
Busy day
I am in KOTESOL conference today.
The presentations i Joined were great!!!
busy but happy day!