[smcl]

Yeah you'd think that after Ondřej reached out to the organisers they'd:

a) give him the benefit of the doubt and say "Not sure what happened, sorry we've unblocked you" (most likely thing)

b) tell him whatever heinous deed he is supposed to have done

IME blocks are either accidental or for some really annoying or inappropriate behaviour. I mean it's "just" a block on twitter, but it's pretty weird for a conference to engage with the community like this.