Is it okay to celebrate wedding anniversaries or Mother's/Father's Day?

Similar to birthdays (Q9), scholars are divided on wedding anniversaries and days like Mother's Day/Father's Day, and the reasoning tracks closely with the birthday discussion. Scholars who discourage such observances generally do so on the same "unnecessary innovation" (bid'ah) grounds applied to birthdays — these aren't practices from the Prophet's ﷺ time, and some worry that treating a specific calendar date as obligatory or ritually significant edges toward imitating non-Islamic religious/cultural customs, especially since some of these days have specific Western/commercial or even pagan historical origins.

Other scholars hold that marking an anniversary or expressing gratitude to parents on a particular day is simply a neutral cultural custom, not a religious rite, and is permissible as long as it doesn't involve haram elements and isn't treated as religiously obligatory — with the added observation that honoring parents (birr al-walidayn) is a constant, year-round Islamic obligation in any case (Quran 17:23-24), so a specific day of extra appreciation for one's mother or father isn't itself objectionable content-wise, even if the specific calendar-day framing is a modern, non-Islamic-origin custom. As with birthdays, most scholars agree the real red lines are any haram content involved (immodest parties, mixed-gender celebrations, extravagant wasteful spending) rather than the act of marking the day itself — practicing Muslims commonly follow whichever position their own trusted scholar holds.

Source: About Islam, "Can Muslims Celebrate Birthdays or Wedding Anniversary?"; Quran 17:23-24 on honoring parents as a general, ongoing obligation; general fiqh discussion of bid'ah and permissible cultural custom (adah).