In 오전수업을선호하지만토요일오후에만갈수있어요, mornings are preferred but only Saturday afternoon is feasible. Apply preferences after checking requirements.
Noun
Conditional form
주말
주말이라면갈수있어요.
오후
오후라면갈수있어요.
금요일
금요일이라면갈수있어요.
In these examples use 이라면 after a noun ending in a consonant and 라면 after a vowel. 주말이라면 states a condition, not a confirmation that the event is on a weekend.