My MIL always reminds me to send cards to BIL's and SIL's for their wedding anniversaries. I do. But only because we receive cards from them, no doubt as they are reminded too. But I don't care about getting anniversary cards from other people. Surely it only matters that your DP remembers? I wouldn't expect to receive anniversary cards from all of my friends or. It's just yet more pressure to remember yet another date. Aren't birthdays and christmas enough? I may be a sourpuss but I just get totally vexed with all this card-sending.