That's it really....DH has made me slightly paranoid that DD's friends' parents will not want their kids to attend a tea-party for her first communion. There would be no religious element to the party itself (that's happening earlier in the day), although DD has spotted some themed plates she likes she could be persuaded towards something secular if that would make it less uncomfortable.
My family is very multi-culti and i grew up going to Bar Mitzvah parties etc. so it hadn't occurred to me that anyone would feel uneasy about going to such a party.