Yes, Douglas Hodge was probably still on his vacation when your friend saw the production of La Cage.
There always seems to be this belief that the leads of shows (especially ones that are more prominent in the theater community) do not perform matinees. In fact, the fact that some of these performers are dedicated and prominent within the community would lead me to believe that they'd want to perform all eight shows.
While there have been instances where the main star only performed evening shows (or only six performances such as Frankie Valli/Jersey Boys and Christine/Phantom of the Opera), this is not typically the case. And I do recall one show within the past few years where a celebrity would only perform the evening shows, but forgot which show it was. An alternate would be listed on the shows website listing both actors specifically stating on what days each would perform.
Yes, Hodge won the Tony and has received many raves from the theater community. And unless he is sick or on vacation, he should be up onstage eight times a week!
"We like to snark around here. Sometimes we actually talk about theater...but we try not to let that get in our way." - dramamama611