Related Clues:

• Cellphone billing period, often
• May, say
• Slash preceder
• Fraction of a quarter
• Eg, January
• Black History ___
• Any of 12 represented in this puzzle's shaded squares
• Unit of time that's hard to rhyme with
• Ramadan, e.g
• May, perhaps, initially meet on Thursday?
• May, e.g
• Calendar viewing option