Are you allowed to get a haircut during the Omer if you are going on a shiduch date?
See HALACHICALLY SPEAKING, Customs During Sefira Part 11:
Shaving for a date
One is not permitted to shave during his custom of sefira even if he has a date.(99)
(99)Harav Yisroel Belsky Shlita, see Piskei Shmuos pages 62-63 quoting the opinion of Harav Elyashiv Shlita.