(dear) members of our club

Yes it's correct, and yes, it would be better to remove it. You might consider just saying "I would like to let all of you know that. . . ."

It is not incorrect if you are on very (very) friendly terms with the members. It is a little informal though. Maybe you are thinking of the "Dear..." salutation that starts a formal letter? I think you missed out the word "know"?

I would like to inform all members that we will be celebrating the club's second anniversary this Sunday, 22 March.

You will notice that I have managed to avoid repeating the word "club".

This is how to use the word 'dear' in the way that you did:

I would like to let all of you, dear friends, know that I am having a birthday party next Sunday, 22 March, and that you are all cordially invited.

Thanks, Roger for pointing the missing 'know'.

Thanks, Contrex, for the crystal-clear detailed reply.

i'd like to let is superfluous tautology, get it
dear is fawning
club should be put to death for redundancy along with 2nd anniversary: formation, this sunday is slang and the date is unnecessary

NEXT SUNDAY IS OUR CLUB'S SECOND ANNIVERSARY

oh, and i'm a bitch

stop padding , be concise or

tell em wot yer gunna tell em
tell em
tell em what yer toldem

solipsister, that was a really poor reply.

Then there was the sign by the store on the beach that said "Fresh Fish for Sale Here."

It's on the beach, so why bother saying the fish were fresh?

Well, yeah, of course they are for sale. Nobody's giving them away.

Here? Well sure, here. Why put up a sign advertising fish in a store, and sending customers on down the road?

Final version of the sign? FISH!

I think you are missing the point here, Roger.