Best rallies at the moment are the BTRDA events, the BRC is a bit dull imo (from a spectator point of view).
Nicky Grist Stages is the next Welsh one for me I expect in July - its a gravel rally in the Crychan, Halfway and Epynt stage area (doesn't go up as far north as Sweetlamb tho). Cracking one this, been twice before
There's also the Mewla in late August which is also up on the Eypnt ranges but is a tarmac event, so a bit different to watch.