As usual, Mike was late for this afternoon's meeting.
Literal
Example [by-によって], Mike [topic-は] today [of-の] afternoon [of-の] meeting [to-に] was-late.
Standard structure — noting Mike's habitual lateness. 会合 ('meeting, gathering') is slightly more formal than 会議. Notice how 例によって ('as usual') is set off by a comma for rhetorical emphasis.